WO2006097337A2 - 11β-HYDROXYSTEROID DEHYDROGENASES - Google Patents

Abstract

The present invention relates to novel 11β-HSD inhibitors as well as to the use of 11 β-HSD inhibitors for the manufacture of pharmaceutical agents for the prevention and/or treatment of metabolic diseases, cancer, cell proliferation, glaucoma, diseases associated with abnormal growth hormone secretion as well as wound healing disorders.

Description

1 lβ-Hydroxysteroid dehydrogenases

Description

The present invention relates to novel 11β-HSD inhibitors as well as to the use of 11β-HSD inhibitors for the manufacture of pharmaceutical agents for the prevention and/or treatment of metabolic diseases, cancer, cell proliferation, glaucoma, diseases associated with abnormal growth hormone secretion as well as wound healing disorders.

BACKGROUND OF THE INVENTION

1 lβ-Hydroxysteroid dehydrogenase ( llβ-HSD) is an enzyme system that catalyses the interconversion of active glucocorticoids to their inactive metabolites, and is now established as a crucial mechanism modulating corticosteroid hormone action. Two isozymes have been identified. In vivo, llβ-HSD1 acts predominantly as an oxoreductase using NADP(H) as a cofactor to generate Cortisol, whereas llβ-HSD2 acts exclusively as an NAD-dependent dehydrogenase, inactivating Cortisol to cortisone. Alterations in its activity have been implicated in several human diseases, including hypertension, intra-uterine growth retardation and obesity. With the ever-increasing interest in llβ-HSD, there have also been several new tissue types and disease processes in which this enzyme system has been identified. The cellular actions of corticosteroid hormones are largely mediated through binding to nuclear receptors that act as ligand-inducible transcription factors. In mammalian tissues, the two isozymes of llβ- hydroxysteroid dehydrogenase ( llβ-HSD) have a pivotal role in the prereceptor regulation of corticosteroid hormone action [1], catalysing the interconversion of hormonally active glucocorticoids (GCs; Cortisol and corticosterone) and their inactive 11-keto forms (cortisone and 11- dehydrocorticosterone). llβ-HSD1 was originally isolated from rat liver [2], and the gene, which is located on chromosome 1q32.2, includes six exons, is over 30 kb in length [3] (largely attributed to the length of intron 4 (25 kb)) and encodes a 34-kDa protein that resides within the endoplasmic reticulum. llβ-HSD1 enzyme activity is bidirectional, possessing both dehydrogenase (Cortisol to cortisone) and reductase (cortisone to Cortisol) components [1]. It is predominantly a reductase when studied in intact cells or organs in vivo, as has been shown in liver and adipose tissue [4], whereas in tissue homogenates and upon purification, dehydrogenase activity prevails [5,6]. However, under certain conditions such as reduced co-factor availability and/or in disease states its dehydrogenase (Cortisol inactivation) might predominate.

By contrast, the human llβ-HSD2 isozyme is a high-affinity NAD- dependent, unidirectional dehydrogenase that converts Cortisol to cortisone

[1]. The gene is located on chromosome 16q22, is 6.2 kb in length, comprising five exons [7] and encoding a 44-kDa protein, which shares only

14% sequence homology with llβ- HSD1. Our understanding of the function of llβ-HSD2 has uncovered an important physiological observation. Mineralocorticoid receptors (MRs) have equal affinity for aldosterone and Cortisol, and llβ-HSD2 functions to protect the MR from illicit occupation by the higher circulating concentrations of Cortisol, and its consequent inactivation to cortisone [8]. Therefore, tissue distribution is generally restricted to mineralocorticoid target tissues, such as kidney [9], sweat glands, salivary glands and colonic mucosa [10], where it colocalizes with the MR and is intricately involved in salt and water balance. Genetic defects in each isozyme have been associated with human disease.

Mutations in the gene encoding llβ-HSD2 (HSD Ilβ2) give rise to a rare, inherited form of hypertension, the syndrome of apparent mineralocorticoid excess (AME) [11]. In patients with this disease, in spite of normal circulating concentrations, Cortisol induces mineralocorticoid hypertension. AME represents a spectrum of diseases with a close correlation between genotype and phenotype. 'Severe' mutations, as characterized by a lack of conversion of Cortisol to cortisone when mutant cDNAs are expressed In vitro [12], result in grossly raised urinary cortisolrcortisone metabolite ratios and juvenile- or neonatal- onset hypertension. Conversely, and of relevance to broader populations of hypertensives, patients with 'milder' mutations present with an intermediate biochemical phenotype (i.e. less abnormal urinary cortisol:cortisone metabolite ratios) in adolescence or early adulthood [13]. Heterozygotes often present with low-renin 'essential' hypertension in late adult life, notably both parents of the original index case of AME described by Edwards and Stewart [8]. Apparent cortisone reductase deficiency, in many ways the exact opposite of AME, has been reported in several anovulatory, hyperandrogenic women and patients with polycystic ovary syndrome (PCOS). Patients display a deficiency in the conversion of cortisone to Cortisol that results in an increased metabolic clearance rate of Cortisol. This is the stimulus to activate the hypothalamus- pituitary-adrenal axis to maintain normal circulating Cortisol concentrations, but at the expense of adrenocorticotrophin- mediated adrenal androgen excess. As a consequence, patients show hirsutism, acne and oligo- or amenorrhea [14- 17]. The biochemical abnormalities suggest a defect in the gene encoding llβ-HSD1 (HSD Ilβ1) but, to date, no mutations have been identified, although only exonic regions have been sequenced and in only a few cases.

The ability of peripheral tissues to regulate corticosteroid concentrations through llβ-HSD isozymes is established as an important mechanism in the pathogenesis of diverse human diseases. Modulation of enzyme activity offers a novel therapeutic approach to treating human disease by circumventing the consequences of systemic GC excess or deficiency. However, to achieve this goal, the development of specific inhibitors that do not interfere with other enzymes is required.

The present invention describes the generation of specific inhibitors against 11β-HSD1 and/or 11β-HSD2 to either selectively or combined inhibition of the enzymes. Furthermore, the inhibitors allow the tissue specific fine tuning - A - of local Cortisol levels to compensate for Cortisol excess or deficiencies.

It was an object of the invention to provide 11β-HSD inhibitors for use in other fields of application. According to the invention this object is achieved by the use of 11β-HSD inhibitors for the production of a pharmaceutical agent for the prevention and/or treatment of metabolic diseases or cancer and/or cell proliferation or glaucoma or of diseases associated with abnormal growth hormone secretion or of wound healing disorders. The

11 β-HSD inhibitors used according to the invention preferably are an 11 β- HSD inhibitor or a salt thereof, wherein said llβ-HSD type 1 inhibitor is selected from the group consisting of the following formulas I to III:

wherein X, Y and Z each independently represent halogen, in particular, F, Cl, I or Br, CrC₆ alkyl, C₅-Ci₅ aryl or CrC₆ alkoxy, n represents an integer from 1 to 10, in particular, from 1 to 4,

L represents an amide, amine, sulfonamide, ester, thioester or keto group, T, U, V and W each independently represent an oxo, thio, ketone, thioketone, CrC₆ alkyl or CrC₆ alkanol group,

Ar represents an aromatic ring system, and

Cyc represents a cyclic ring system,

(H)

wherein

A represents a C1-C10 ester (C1-C10 alkyl-CO-O-), a C₁-Ci₀ amide (C₁-C₁₀ a!kyl-CO-NH-), a CrCi₀ ether or a C1-C10 ketone (C1-C10 alkyl-CO-) group,

B and C each independently represent an oxo group, a keto group, a

CrC₆ alkanol group or a C₁-C₆ alkyl group, m is an integer from 1 to 10, in particular, from 1 to 4, and D is a group selected from COOR¹ or CONR²R³, wherein R¹, R² and R³ each independently represent H or a CrC₆ alkyl group,

wherein

E represents an OH, a C1-C10 ester (C₁-Ci₀ alkyl-CO-O-), a C₁-Ci₀ amide (CrC₁₀ alkyl-CO-NH-), a CrCi₀ ether (C₁-C₁₀-O-) or a C₁-Ci₀ ketone (C1-C10 alkyl-CO-) group, F represents an oxo group, keto group, a CrC₆ alkanol group or a d-

C₆ alkyl group, and

G is group selected from COOR¹ or CONR²R³, wherein R¹, R² and R³ each independently represent H or a CrC₂₀ hydrocarbon group, in particular, a CrC₆ alkyl group.

In a special embodiment, the 11β-HSD inhibitor used is 18-β-glycyrrhetinic acid or a derivative thereof such as glycyrrhizine, glycyrrhizinic acid, carbenoxolone or 2-hydroxyethyl-18β-glycyrrhetinic acid amide.

The inhibitors used according to the invention are inhibitors of 11β-HSD- type 1 and/or type 2. Particularly preferably, selective 11β-HSD-type 1 inhibitors or selective 11β-HSD-type 2 inhibitors are concerned. Especially preferably, one of the compounds substance 1 to substance 29 are concerned, even more preferably, one of the compounds selected from substance 16, substance 7, substance 13, substance 24, substance 25, substance 9 or substance 14, and most preferably, substance 16 or substance 7. It has been found that, in particular, compounds 16 and 7 are selective 11β-HSD1 inhibitors which show no inhibition for 11β-HSD2, 17β- HSD1, 17β-HSD2.

It has also been found that the measured inhibition behavior of compounds can be different when using either cell lysates or intact cells. This means that, in particular, data obtained from cell lysates or other in vitro systems cannot reflect the effect of the substances in vivo. For example, especially compounds based on glycyrrhetinic acid, in particular, compounds having formula III as described herein, often show higher inhibition of 11β-HSD2, compared with 11β-HSD1 , in analyses using cell lysates. When using intact cells as a measurement system, however, a switch in their preference is observed to inhibit 11β-HSD1 instead of 11β-HSD2. However, inhibition of

11 β-HSD1 has considerable therapeutic use for glucocorticoid-associated diseases including obesity, diabetes, wound healing and muscle atrophy. Since inhibition of related enzymes such as 11 β-HSD2 and 17β-HSDs cause sodium retention and hypertension or interfere with 6-steroid hormone metabolism, highly selective 11β-HSD1 inhibitors are required for successful therapy. Herein, several selective inhibitors and medical applications thereof are presented. For example, compound 16 shows an IC₅₀ [μM] for 11β-HSD1 of 0.144 ± 0.27 determined in lysates of HEK-293 cells and an IC₅₀ [μM] for 11 β-HSD1 of 0.41 ± 0.08 determined in intact transfected HEK-293 cells and, thus, a high specificity for this enzyme while it shows IC₅₀ [μM] values for 11β-HSD2 (determined in lysates of HEK-293 cells) of 3.95 ± 0.12, for 17β-HSD1 of greater than 30 μM, for 17β-HSD2 of 28.3 ± 5.5 and for 11 β- HSD2 (determined in intact transfected HEK-293 cells) of greater than 50 μM.

llβ-HSD1 , OBESITY AND INSULIN SENSITIVITY

One aspect of the present invention, therefore, is the use of an llβ-HSD inhibitor or a pharmaceutically acceptable salt thereof, in particular, selected from the group consisting of substances 7, 13, 14, 16, 24, 25, 1-6, 8-12, 15, 17-23 or a compound of formula I, Il or III for the manufacture of a pharmaceutical agent for the prevention and/or treatment of metabolic diseases. For this medical indication, preferably 11β-HSD1 inhibitors are used.

Specifically, the invention relates to the prevention and/or treatment of obesity or insulin sensitivity and, in particular, diabetes type II.

In patients with Cushing's syndrome, florid but reversible central adiposity is observed in the setting of GC excess. This observation stimulated several groups to assess the involvement of Cortisol in the development of visceral adiposity. However, in simple obesity, circulating Cortisol concentrations are normal (occasionally lower), with increased Cortisol secretion rates [35], suggesting that, in peripheral tissues, Cortisol metabolism via llβ-HSDs, might be disturbed. llβ-HSD1 , but not llβ-HSD2, is synthesized in human adipose tissue, both in preadipocytes and adipocytes. In vitro studies confirmed the stimulatory effects of Cortisol on the differentiation of adipose stromal cells to mature adipocytes, with inhibition of llβ-HSD1 by glycyrrhetinic acid preventing cortisone-induced differentiation [36]. This work has been extended with the development of in vivo transgenic animal models. Overexpression of HSD Ilβ1 in adipose tissue resulted in a threefold accumulation of visceral adipose tissue [37]. Crucially, this work showed that prereceptor metabolism of GCs by llβ-HSD1 resulted in increased 'active' GC concentrations within adipose tissue and represents an important step forward. Most clinical studies [38,39], but not all [40], have shown decreased llβ-HSD1 activity in obesity by measuring urinary cortisokcortisone metabolite ratios. However, such studies have mainly measured hepatic llβ-HSD1 activity and it has been widely hypothesized that, within adipose tissue itself, there is an increase in llβ-HSD1 synthesis in obesity. This pattern of expression has been shown in the rodent model of obesity, the Zucker rat [41], but there have been conflicting reports from human studies. Data on subcutaneous abdominal biopsies from obese men and women showed higher levels of enzyme activity in cell homogenates in two separate studies [39,40]. Furthermore, mRNA analyses have shown increased llβ-HSD1 synthesis in obese subcutaneous adipocytes of obese people. However, using paired omental and subcutaneous samples from over 30 patients, Tomlinson et al. [42] were unable to correlate whole-tissue or adipocyte llβ-HSD1 synthesis with obesity. Crucially, however, they did show a mild reduction in synthesis and activity from cultured preadipocytes in obese individuals. This could lead to enhancement of proliferation of the preadipocytes owing to decreased Cortisol generation. As a consequence, more preadipocytes will be available to undergo differentiation and lipid accumulation, and in this way could contribute to the increases in visceral adipose tissue mass seen in obese patients. In summary, it seems unlikely that over expression of llβ-HSD1 in visceral adipose tissue is a primary cause of obesity, but inhibition of the autocrine generation of Cortisol at this site might lead to reduced adipogenesis.

Further compelling data that llβ-HSD1 can increase intracellular GC concentrations have come from studies of liver, in which GCs oppose the actions of insulin by regulating key gluconeogenic enzymes. Pharmacological inhibition of llβ-HSD1 in healthy men [43] and patients with type 2 diabetes mellitus [44] caused a lowering of intrahepatic GC levels, leading to reduced hepatic glucose output and enhanced lipid catabolism. Mice with targeted disruption of HSD Ilβ1 , resistant to stress- induced or high-fat diet-induced obesity, showed increased insulin sensitivity [45] and enhanced lipid oxidation [46]. Recently, a new selective class of llβ-HSD1 inhibitor, the arylsulfonamidothiazoles [47], has been developed which, in a mouse model, has been shown to improve insulin sensitivity [48], and which could therefore be useful for the treatment of diabetes mellitus.

CANCER AND CELL PROLIFERATION

Another object of the present invention is the use of the llβ-HSD inhibitors for the manufacture of a pharmaceutical agent for the prevention and/or treatment of cancer and/or cell proliferation. The compounds described herein are excellently suited, in particular, for the treatment of breast cancer, colon cancer, leukemia or gastrointestinal cancer. For these medical indications, preferably 11 β-HSD2 inhibitors are used.

Based on these precedents, there has been great interest in the role of llβ- HSD2 in human hypertension and, to a lesser extent, the role of llβ-HSD1 in PCOS [18]. However, as we have acquired more knowledge about the expression, function and regulation of llβ-HSD isozymes, other unexpected connections have emerged. Thus, we could establish a relationship between llβ-HSD2 and cancer. An established role of GCs is to inhibit cell proliferation and stimulate cellular differentiation. Although llβ-HSD1 and llβ-HSD2 are the products of separate genes and are synthesized in distinct tissues, the concept that their actions are entirely separate no longer appears to be true. Instead, it seems that, at key points in development, there is a 'switch¹ occurring between the anti-proliferative effects of llβ- HSD1 and the pro-proliferative effects of llβ-HSD2. In contrast to normal tissues, llβ-HSD2 in this context appears to regulate Cortisol exposure to the GC receptor (GR)₁ rather than to the MR, and evidence for this has come from studies of normal tissues throughout development. Throughout early foetal development, llβ-HSD2 is synthezised in many tissues, such as bone and adrenal, where, in adult life, llβ-HSD1 is synthesized [19]. A more dramatic switch in llβ-HSD synthesis implicates llβ-HSD2 as a putative oncogene. In several neoplastic cells types, there is a high level of expression of HSD Ilβ2 in contrast to normal tissue equivalents, which only synthesize llβ- HSD1. For example, adrenal cortical adenomas and carcinomas synthesize llβ-HSD2 [20]. The relative synthesis of llβ-HSD2 can be used to determine the phenotype of adrenal adenomas, with high levels of mRNA in non-functioning adenomas and adenomas causing overt Cushing's syndrome [21]. In the pituitary, there is a marked difference between normal and tumourous tissue with respect to llβ-HSD2 synthesis. llβ-HSD2 levels are high in pituitary tumours, irrespective of type, and the enzyme is virtually absent from normal tissue [22]. Quantitative real-time

PCR revealed a change in isozyme synthesis from llβ-HSD1 in normal pituitaries to a tenfold induction of the synthesis of llβ-HSD2 in tumours

[23]. Rabbitt and co-workers further investigated the role of llβ-HSDs in cellular proliferation, using transfection experiments [24]. In stably transfected cells overexpressing HSD Ilβ2, cellular proliferation was increased compared with mock-transfected cells; conversely, proliferation rates were, lower in cells overexpressing HSD Ilβ1.

llβ-HSD2 synthesis has also been documented in ductal and lobular breast epithelial cells [25], with increased synthesis of llβ-HSD2 observed in invasive carcinomas. This, taken together with the observation that inhibition of llβ-HSD2 potentiates the antiproliferative actions of GCs in some breast [26] and endometrial cancer cell lines [27], further endorses a putative role for llβ-HSD2 activity in tumourigenesis llβ-HSD1 AND GLAUCOMA

The invention further relates to the use of the llβ-HSD inhibitors described herein for the treatment of glaucoma. For this medical indication, preferably 11 β-HSD1 inhibitors are used.

Topical and systemic GCs are used in a diverse range of conditions in clinical ophthalmology, and one of the most significant complications is corticosteroid-induced glaucoma. This condition is characterized by a significant increase in intraocular pressure (lOP), which, if untreated, can lead to visual field loss and blindness. IOP is maintained by a balance between production and drainage of aqueous humour. The major site of aqueous production is from the non-pigmented epithelial cells (NPE) of the ciliary body, whereas drainage is predominantly through the cells of the trabecular meshwork. The eye represents an important target tissue for corticosteroids, containing both MRs [28] and GRs [29]. Corticosteroids have long been implicated in the natural diurnal variation of IOP [30], and raised IOP can also occur in patients with Cushing's syndrome [31]. Several groups have used immunohistochemical and in situ hybridization analyses to assess the synthesis of llβ-HSDs in a variety of human ocular tissues, and have reported conflicting results. One of the studies localized HSD Ilβ2 mRNA and the llβ-HSD2 protein in the NPE, with coexpression of MR [32]. Because the NPE has morphological characteristics of epithelia engaged in salt and water transport, this was perhaps not surprising. However, Stokes et al. [33] and Rauz et al. [34] localized llβ-HSD1 to this tissue type, suggesting that it is this isozyme that has an important role in aqueous humour production. Rauz and co-workers also demonstrated mRNA for GR₁

MR and llβ-HSD1 (but not for llβ~HSD2) in a human ciliary epithelial cell line, ODM-2 [34]. In addition, they noted that aqueous humour concentrations of 'free' Cortisol greatly exceeded those of cortisone (GC/MS analysis - Cortisol :cortisone ratio 14:1 , compared with circulating

Cortisol :cortisone of ,3:1), consistent with local llβ-HSD1 activity generating cortisol from cortisone. The functional significance of llβ-HSD1 in the eye was then investigated by administering a non-specific llβ-HSD inhibitor, carbenoxolone (CBX), to healthy volunteers [34]. After seven days of CBX, IOP was reduced by 17.5%, in keeping with the hypothesis that inhibition of llβ-HSD1 within the NPE reduces local Cortisol generation, causing a fall in IOP (Fig. 3). An important application of these findings could be in the therapeutic management of glaucoma, with topical preparations of CBX or more selective llβ-HSD1 inhibitors effective in lowering IOP. However, a more critical analysis defining the role of llβ-HSD1 in regulating epithelial Nap transport within the eye and HSD Ilβ1 expression in glaucoma is required.

GROWTH HORMONE AND llβ-HSD

The invention also relates to the use of the llβ-HSD inhibitors for the prevention and/or treatment of diseases associated with abnormal growth hormone secretion.

Many of the clinical features of patients with abnormal growth hormone (GH) secretion can be explained by altered llβ-HSD activity, notably hypertension in acromegaly [55,56] and obesity, insulin resistance and osteopaenia in GH deficiency (GHD) [57], Neither GH nor insulin-like growth factor I (IGF-I) has an effect upon renal llβ-HSD2 activity, and the increased Na retention seen in acromegaly is unlikely to involve this mechanism. However, hypopituitary GHD patients have raised urinary cortisoLcortisone metabolite ratios. These return to normal upon replacement therapy with GH, and are indicative of a decrease in llβ-HSD1 oxoreductase activity [58]. Similarly, in patients with active acromegaly, there is a decrease in the cortisohcortisone metabolite ratio that corrects with suppression of GH levels by surgery, somatostatin analogues or GH receptor antagonists [59,60], indicative of increased llβ-HSD1 activity. In vitro, IGF-I but not GH itself, inhibits llβ-HSD1 [59]. These data could have important clinical ramifications, and it is interesting to speculate that the phenotype of GH deficiency in the context of hypopituitarism (obesity, insulin resistance and osteoporosis) might be an indirect effect of GH action on Cortisol metabolism through llβ-HSD1.

OTHER THERAPIES

The invention also relates to the use of the 11β-HSD inhibitors for the treatment of wound healing disorders.

Bone physiology and 11-β-HSD

The adverse effects of GCs on skeletal tissue have been recognized for many years and the continued exposure of bone cells to even modest doses of GCs results in osteoporosis [49]. However, these are mainly attributable to nonphysiological treatment with synthetic corticoids, which usually exceed physiological levels by a factor of 10-100. In vivo, this is partly a result of the indirect effects of GCs on Ca2b homeostasis and synthesis of skeletal growth factors and hormones. In vitro, GCs have effects on both bone- resorbing cells (osteoclasts) and bone-forming cells (osteoblasts), where their actions are complex, involving both direct and indirect effects on proliferation and differentiation in both cell types. This has prompted much recent work to assess the relative synthesis of llβ-HSD1 and -2 in bone and their ability to influence local GC concentrations within this tissue type.

Using human osteosarcoma cell lines, Bland et al. [50] first described the presence of llβ-HSD dehydrogenase activity in osteoblastic cells. This was found to correlate with GR expression levels rather than those of MR. Subsequent enzyme kinetic and mRNA analyses determined the presence of llβ-HSD2 in these osteosarcoma cells. These observations were further supported by studies using rat osteosarcoma cells [51]. By contrast, in cultures of primary human osteoblasts, and cells from normal adult bone (osteoclasts and osteoblasts), llβ-HSD1 is the predominant isozyme, with llβ-HSD2 being virtually undetectable [52]. llβ-HSD1 activity was stimulated by proinflammatory cytokines, specifically interleukin 1 and tumour necrosis factor a, whereas llβ-HSD2 was inhibited [53], suggesting that these factors might sensitize skeletal tissue to GC action and might represent one of the mechanisms contributing to inflammation-mediated periarticular osteoporosis in infants. However, it must be emphasized that physiological low dose glucocorticoid therapy has been demonstrated to have bone sparing effects in diseases such as rheumatoid arthritis. Furthermore, in an established animal model for rheumatoid arthritis it was demonstrated that blocking of llβ-HSD dehydrogenase activity results in significantly reduced inflammation and bone, as well as cartilage loss. Thus, increasing endogenous glucocortioids mimics the effects of low dose physiologic corticoisteroid treatment. These findings are in stark contrast with the above formulated speculation that enhanced endogenous glucocorticoid synthesis might contribute to inflammation and/or immune mediated bone loss. Finally, it was demonstrated that patients suffering from rheumatoid arthritis may in deed have significantly lower tissue levels of Cortisol as a result of enhanced Cortisol catabolism (R. Straub, personal communication); since lack of endogenous glucocorticoids enhances pathological bone loss in adjuvant induced arthritis, it is becoming increasingly clear that increasing glucocortiods with either physiological supplementation or by blocking endogenous catabolism by 11-β-HSD could result in a bone sparing effect. This has recently been demonstrated by the use of an established inhibitor of Cortisol catabolism; i.e. glycyrrhetinic acid. Thus, selective and more potent inhibitors to block glucocorticoid catabolism will significantly improve the treatment of pathologies associated with inflammation and/or immune mediated bone loss.

Changes in llβ-HSD1 in primary cultures of human bone have also been correlated with age, with enhanced activity reported in osteoblasts from older individuals [54], implicating a role for llβ-HSD1 in the pathogenesis of senile osteoporosis.

It is also to be understood that the compound/composition of the present invention has other important medical implications.

For example, the compound or composition of the present invention may be useful in the treatment of the disorders listed in WO-A-99/52890.

In addition, or in the alternative, the compound or composition of the present invention are useful in the treatment of the disorders listed in WO-A- 98/05635. For ease of reference, part of that list is now provided: cancer, inflammation or inflammatory disease, dermatological disorders, fever, cardiovascular effects, haemorrhage, coagulation and acute phase response, cachexia, anorexia, acute infection, HIV infection, shock states, graft-versus-host reactions, autoimmune disease, reperfusion injury, meningitis, migraine and aspirin-dependent anti-thrombosis; tumour growth, invasion and spread, angiogenesis, metastases, malignant, ascites and malignant pleural effusion; cerebral ischaemia, ischaemic heart disease, osteoarthritis, rheumatoid arthritis, osteoporosis, asthma, multiple sclerosis, neurodegeneration, Alzheimer's disease, atherosclerosis, stroke, vasculitis, Crohn's disease and ulcerative colitis; periodontitis, gingivitis; psoriasis, atopic dermatitis, chronic ulcers, epidermolysis bullosa; corneal ulceration, retinopathy and surgical wound healing; rhinitis, allergic conjunctivitis, eczema, anaphylaxis; restenosis, congestive heart failure, endometriosis, atherosclerosis or endosclerosis.

In addition, or in the alternative, the compound or composition of the present invention are useful in the treatment of disorders listed in WO-A-98/07859. For ease of reference, part of that list is now provided: cytokine and cell proliferation/differentiation activity; immunosuppressant or immunostimulant activity (e.g. for treating immune deficiency, including infection with human immune deficiency virus; regulation of lymphocyte growth; treating cancer and many autoimmune diseases, and to prevent transplant rejection or induce tumour immunity); regulation of haematopoiesis, e.g. treatment ofmyeloid or lymphoid diseases; promoting growth of bane, cartilage, tendon, ligament and nerve tissue, e.g. for healing wounds, treatment of burns, ulcers and periodontal disease and neurodegenertion; inhibition or activation of follicle-stimulating hormone (modulation of fertility); chemotactic/chemokinetic activity (e.g. for mobilising specific cells types to sites of injury or infection); haemostatic and thrombolytic activity (e.g. tor treating haemophilia and stroke); antiinflammatory activity (for treating e.g. septic shock, or Crohn's disease); as antimicrobials; modulators of e.g. metabolism or behaviour; as analgesics; treating specific deficiency disorders; in treatment of e.g. psoriasis, in human or veterinary medicine.

In addition, or in the alternative, the composition of the present invention may be useful in the treatment of disorders listed in WO-A-98/09985. For ease of reference, part of that list is now provided: macrophage inhibitory and/or T cell inhibitory activity and thus, anti- inflammatory activity; anti- immune activity, i.e. inhibitory effects against a cellular and/or humoral immune response, including a response not associated with inflammation; inhibit the ability of macrophages and T cells to adhere to extracellular matrix components and fibronectin, as well as up-regulated fas receptor expression in T cells; inhibit unwanted immune reaction and inflammation including arthritis, including rheumatoid arthritis, inflammation associated with hypersensitivity, allergic reactions, asthma, systemic lupus erythematosus, collagen diseases and other autoimmune diseases, inflammation associated with atherosclerosis, arteriosclerosis, atherosclerotic heart disease, reperfusion injury, cardiac arrest, myocardial infarction, vascular inflammatory disorders, respiratory distress syndrome or other cardiopulmonary diseases, inflammation associated with peptic ulcer, ulcerative colitis and other diseases of the gastrointestinal tract, hepatic fibrosis, liver cirrhosis or other hepatic diseases, thyroiditis or other glandular diseases, glomerulonephritis or other renal and urologic diseases, otitis or other oto-rhino-laryngological diseases, dermatitis or other dermal diseases, periodontal diseases or other dental diseases, orchitis or epididimo-orchitis, infertility, orchidal trauma or other immune-related testicular diseases, placental dysfunction, placental insufficiency, habitual abortion, eclampsia, pre-eclampsia and other immune and/or inflammatory- related gynaecological diseases, posterior uveitis, intermediate uveitis, anterior uveitis, conjunctivitis, chorioretinitis, uveoretinitis, optic neuritis, intraocular inflammation, e.g. retinitis or cystoid macular oedema, sympathetic ophthalmia, scleritis, retinitis pigmentos; immune and inflammatory components of degenerative fondus disease, inflammatory components of ocular trauma, ocular inflammation caused by infection, proliferative vitreo-retinopathies, acute ischaemic optic neuropathy, excessive scarring, e.g. following glaucoma filtration operation, immune and/or inflammation reaction against ocular implants and other immune and inflammatory-related ophthalmic diseases, inflammation associated with autoimmune diseases or conditions or disorders where, both in the central nervous system (CNS) or in any other organ, immune and/or inflammation suppression would be beneficial, Parkinson's disease, complications and/or side effects from treatment of Parkinson's disease, AIDS-related dementia complex HIV-related encephalopathy, Devic's disease, Sydenham chorea, Alzheimer's disease and other degenerative diseases, conditions or disorders of the CNS, inflammatory components of stokes, post-polio syndrome, immune and inflammatory components of psychiatric disorders, myelitis, encephalitis, subacute sclerosing pan-encephalitis, encephalomyelitis, acute neuropathy, subacute neuropathy, chronic neuropathy, Guillaim-Barre Syndrome, Sydenham chora, myasthenia gravis, pseudo-tumour cerebri, Down's Syndrome, Huntington's disease, amyotrophic lateral sclerosis, inflammatory components of CNS compression or CNS trauma or infections of the CNS, inflammatory components of muscular atrophies and dystrophies, and immune and inflammatory related diseases, conditions or disorders of the central and peripheral nervous systems, post-traumatic inflammation, septic shock, infectious diseases, inflammatory complications or side effects of surgery, bane marrow transplantation or other transplantation complications and/or side effects, inflammatory and/or immune complications and side effects of gene therapy, e.g. due to infection with a viral carrier, or inflammation associated with AIDS, to suppress or inhibit a humoral and/or cellular immune response, to treat or ameliorate monocyte or leukocyte proliferative diseases, e.g. leukaemia, by reducing the amount of monocytes or lymphocytes, for the prevention and/or treatment of graft rejection in cases of transplantation or natural or artificial cells, tissue and organs such as cornea, bone marrow, organs, tenses, pacemakers, natural or artificial skin tissue.

It is particularly preferred in the above uses to employ a compound selected from substances 7, 13, 14, 16, 24 and 25.

PHARMACEUTICAL COMPOSITIONS

In one aspect, the present invention provides a pharmaceutical composition, which comprises a compound according to the present invention and optionally a pharmaceutical acceptable carrier, diluent or excipient (including combinations thereof).

The pharmaceutical composition comprises, as an active ingredient, an 11β-

HSD inhibitor or a salt thereof, wherein said llβ-HSD type 1 inhibitor is selected from the group consisting of the following formulas I to III:

wherein

X, Y and Z each independently represent halogen, in particular, F, Cl, I or Br, CrC₆ alkyl, C₅-C₁₅ aryl or d-C₆ alkoxy, n represents an integer from 1 to 10, in particular, from 1 to 4,

L represents an amide, amine, sulfonamide, ester, thioester or keto group,

T, U, V and W each independently represent an oxo, thio, ketone, thioketone, CrC₆ alkyl or Ci-C₆ alkanol group,

Ar represents an aromatic ring system, and

Cyc represents a cyclic ring system, with the proviso that the compound is not substance 7,

wherein

A represents -OH, a C₁-Ci₀ ester (C1-C10 alkyl-CO-O-), a C₁-Ci₀ amide (CrC₁₀ alkyl-CO-NH-), a Ci-Ci₀ ether or a C1-C10 ketone (CrC₁₀ alkyl- CO-) group, B and C each independently represent an oxo group, a keto group, a

C₁-C₆ alkanol group or a CrC₆ alkyi group, m is an integer from 1 to 10, in particular, from 1 to 4, and D is a group selected from COOR¹ or CONR²R³, wherein R¹, R² and R³ each independently represent H or a C₁-C₆ alkyl group, with the proviso that the compound is not substance 16,

wherein E represents represents an OH, C₁-Ci₀ ester (C_rCi₀ alkyl-CO-O-), a C₁-

Cio amide (C₁-C₁₀ alkyl-CO-NH-), a C₁-Ci₀ ether (Ci-Ci₀-O-) or a C₁-Ci₀ ketone (Ci-Ci₀ alkyl-CO-) group,

F represents an oxo group, keto group, a C₁-C₆ alkanol group or a C₁- C₆ alkyl group, and

G is is a group selected from COOR¹ or CONR²R³, wherein R¹, R² and

R³ each independently represent H or a C₁-C₂₀ hydrocarbon group, in particular, a C₁-C₆ alkyl group, with the proviso that the compound is not a compound of substance 24 or 25.

The pharmaceutical composition may be for human or animal usage in human and veterinary medicine and will typically comprise any one or more of a pharmaceutically acceptable diluent, carrier, or excipient. Acceptable carriers or diluents for therapeutic use are well known in the pharmaceutical art, and are described, for example, in Remington's Pharmaceutical Sciences, Mack Publishing Co. (A.R.Gennaro edit. 1985). The choice of pharmaceutical carrier, excipient or diluent can be selected with regard to the intended route of administration and standard pharmaceutical practice. The pharmaceutical compositions may comprise as - or in addition to - the carrier, excipient or diluent any suitable binder(s), lubricant(s), suspending agent(s), coating agent.(s), solubilising agent(s).

Preservatives, stabilisers, dyes and even flavouring agents may be provided in the pharmaceutical composition. Examples of preservatives include sodium benzoate, sorbic acid and esters of p-hydroxy benzoic acid. Antioxidants and suspending agents may be also used.

There may be different composition/formulation requirements dependent on the different delivery systems. By way of example, the pharmaceutical composition of the present invention may be formulated to be delivered using a mini-pump or by a mucosal route, for example, as a nasal spray or aerosol for inhalation or ingestable solution, or preenterally in which the composition is formulated in an injectable form, for delivery, by, for example, an intravenous, intramuscular or subcutaneous route. Alternatively, the formulation may be designed to be delivered by both routes.

Where the agent is to be delivered mucosally through the gastrointestinal mucosa, it should be able to remain stable during transit through the gastrointestinal tract; for example, it should be resistant to proteolytic degradation, stable at an acidic pH and resistant to the detergent effects of bile.

Where appropriate, the pharmaceutical compositions can be administered by inhalation, in the form of a suppository or pessary, topically in the form of a lotion, solution, cream, ointment or dusting powder, by use of a skin patch, orally in the form of tablets containing excipients such as starch or lactose, or in capsules or ovules either alone or in admixture with excipients or in the form of elixirs, solutions or suspension containing flavouring or colouring agents, or they can be injected parenterally for example intravenously, intramuscularly or subcutaneously. For parenteral administration, the compositions may be best used in the form of a sterile aqueous solution which may contain other substances, for example enough salts or momosaccharides to make the solution isotonic with blood. For buccal or sublingual administration the compositions may be administered in the form of tablets or lozenges which can be formulated in a conventional manner.

Preferably, the 11β-HSD inhibitors used according to the invention are employed in the form of liposomes, oily emulsions or nanoparticles. Administration is preferably effected either i.v. or subcutaneously in the case of liposomes as well as i.m. or subcutaneously in the case of oily emulsions. When administered orally, as also preferred, the active agents are preferably provided in capsules. COMBINATION PHARMACEUTICAL

The compound of the present invention may be used in combination with one or more other active agents, such as one or more other pharmaceutically active agents.

By way of example, the compounds of the present invention may be used in combination with other 11β-HSD inhibitors.

ADMINISTRATION

Typically, a physician will determine the actual dosage which will be most suitable for an individual subject and it will vary with the age, weight and response of the particular patient. The dosages below are exemplary of the average case. There can, of course, be individual instances where higher or lower dosage ranges are merited.

The compositions of the present invention may be administered by direct injection. The composition may be formulated for parenteral, mucosal, intramuscular, intravenous, subcutaneous, intraocular or transdermal administration. Depending upon the need, the agent may be administered at a dose of from 0.01 to 30 mg/kg body weight, such as from 0.1 to 10 mg/kg, more preferably from 0.1 to 1 mg/kg body weight.

By way of further example, the agents of the present invention may be administered in accordance with a regimen of 1 to 4 times per day, preferably once or twice per day. The specific dose level and frequency of dosage for any particular patient may be varied and will depend upon a variety of factors including the activity of the specific compound employed, the metabolic stability and length of action of that compound, the age, body weight, general health, sex, diet, mode and time of administration, rate of excretion, drug combination, the severity of the particular condition, and the host undergoing therapy.

Aside from the typical modes of delivery - indicated above - the term "administered" also includes delivery by techniques such as lipid mediated transfection, liposomes, immunoliposomes, lipofectin, cationic facial amphiphiles (CFAs) and combinations tereof. The routes for such delivery mechanisms include but are not limited to mucosal, nasal, oral, parenteral, gastrointestinal, topical, or sublingual routes.

The term "administered" includes but is not limited to delivery by a mucosal route, for example, as a nasal spray or aerosol for inhalation or as an ingestable solution; a parenteral route where delivery is by an injectable form, such as, for example, an intravenous, intramuscular or subcutaneous route.

Thus, for pharmaceutical administration, the 11 β-HSD inhibitors of the present invention can be formulated in any suitable manner utilising conventional pharmaceutical formulating techniques and pharmaceutical carriers, adjuvants, excipients, diluents etc. and usually for parenteral administration. Approximate effective dose rates may be in the range from 1 to 1000 mg/day, such as from 10 to 900 mg/day or even from 100 to 800 mg/day depending on the individual activities of the compounds in question and for a patient of average (70 kg) body weight. More usual dosage rates for the preferred and more active compounds will be in the range 200 to 800 mg/day, more preferably, 200 to 500 mg/day, most preferably from 200 to 250 mg/day. They may be given in single dose regimes, split dose regimes and/or in multiple dose regimes lasting over several days. For oral administration they may be formulated in tablets, capsules, solution or suspension containing tram 100 to 500 mg of compound per unit dose. Alternatively and preferably the compounds will be formulated for parenteral administration in a suitable parenterally administrable carrier and providing single daily dosage rates in the range 200 to 800 mg, preferably 200 to 500, more preferably 200 to 250 mg. Such effective daily doses will, however, vary depending on inherent activity of the active ingredient and on the bodyweight of the patient, such variations being within the skill and judgement of the physician.

The compounds of the present invention are useful in the manufacture of a medicament for revealing an endogenous glucocorticoid-like effect. Experimental Procedures

Materials

Cell culture reagents were purchased from Invitrogen (Carlsbad, CA), [1,2,6,7-3H]-COiIiSOnO from American Radiolabeled Chemicals (St. Louis, MO) and [1,2,6,7-3H]-cortisol from Amersham Biosciences (General Electrics Healthcare, Piscataway, NJ). Thin layer chromatography (TLC) plates (SIL G-25 UV254) were purchased from Macherey-Nagel, Oensingen, Switzerland.

Assay for 11β-HSD activity

The screening assay used to determine inhibition of 11β-HSD enzyme activity is based on the conversion of radiolabeled cortisone or Cortisol in cell lysates from HEK-293 cells, stably transfected with either human 11 β-

HSD1 or human 11β-HSD2 (Schweizer et al. 2003, Frick et a. 2004). Cells were grown in 10 cm dishes to 80% confluence and incubated for 16 h in steroid-free medium (charcoal-treated fetal calf serum (FCS) from HyClone, Logan, Utah). Cells were rinsed once with phosphate-buffered saline (PBS), dettached and centrifuged for 3 min at 150 x g. The supernatant was removed and the cell pellet quick-frozen in a dry-ice ethanol bath. At the day of experiment, cell pellets were resuspended in buffer TS2 (100 mM NaCI, 1 mM EGTA, 1 mM EDTA, 1 mM MgCI₂, 250 mM sucrose, 20 mM Tris-HCI, pH 7.4), sonicated and activities determined immediately. The rate of conversion of Cortisol to cortisone or the reverse reaction was determined in 96-well optical PCR reaction plates (Applied Biosystems, Foster City, CA) in a final volume of 22 μl, and the tubes were capped during the reaction to avoid evaporation.

Determination of oxidase activity using cell lysates:

Reactions were initiated by simultaneously adding 10 μl of cell lysate and 12 μl of TS2 buffer containing the appropriate concentration of the inhibitory compound to be tested, NAD⁺, 30 nCi of [1 ,2,6,7-³H]-cortisol and unlabeled Cortisol. A final concentration of 400 μM NAD⁺ and 25 nM Cortisol were used. Stock solutions of the inhibitors in methanol or DMSO were diluted in TS2 buffer to yield the appropriate concentrations, whereby the concentration of methanol or DMSO in the reactions were kept below 0.1%. Control reactions with or without 0.1% of the solvent were performed. Incubation was at 37°C for 10 min with shaking, reactions were terminated by adding 10 μl of stop solution containing 2 mM of unlabeled Cortisol and cortisone dissolved in methanol. The conversion of radiolabeled Cortisol was determined by separation of Cortisol and cortisone using TLC and a solvent system of 9:1 (v/v) chloroform:methanol, followed by scintillation counting. In absence of inhibitors approximately 30% of Cortisol was converted to cortisone.

Determination of reductase activity using cell lysates: Reactions were initiated simultaneously by adding 10 μl of cell lysate and 12 μl of TS2 buffer containing the appropriate concentration of the inhibitory compound to be tested, NADPH, 30 nCi of [1 ,2,6,7-³H]-cortisone and unlabeled cortisone, whereby final concentrations were 400 μM NADPH and 100 nM cortisone. Activities were determined immediately after cell disruption by measuring the conversion of radiolabeled cortisone to Cortisol for 10 min.

Determination of activities in intact cells:

Human 11 β-HSD1 and 11 β-HSD2 activities were assessed in intact stably transfected HEK-293 cells. Per well of a 96-well plate 30'0OO cells were seeded, followed by growth for 24 h in steroid-free DMEM medium. The total volume was 30 μl and contained 100 nM of radiolabeled Cortisol or cortisone as substrate and the corresponding inhibitor at a final concentration between 0-200 μM. The reaction was performed in steroid-free medium in the absence of exogenous cofactor for 1 to 3 h at 37°C. The solvent was below 0.1% (DMSO). Reactions were stopped by adding unlabeled Cortisol and cortisone dissolved in methanol (2 mM final). Steroids were separated by TLC and conversion determined by scintillation counting.

Enzyme kinetics were analyzed by non-linear regression using Data Analysis Toolbox (MDL Information Systems Inc.) assuming first-order rate kinetics. Data represent mean ± SD of four to five independent experiments.

For references see publications 61 and 62.

ompounds

-29-

Substance 25

Substance 26

Substance 27

Substance 28

Substance 29

10

15

20

25

30

35 Results

Inhibition of 11β-HSD1 and 11β-HSD2 in cell lysates

Inhibition of 11β-HSD1 was determined at 100 nM cortisone, inhibition of 11β-HSD2 at 25 nM Cortisol as substrates (at approximately 30% of apparent Km concentrations).

Assay with 20 μM of the corresponding compound in the reaction mixture, added simultaneously with the substrate:

11β-HSD1 % of 11β-HSD2 % of

11β-HSD1 control control control 100 100

10 μM CBX4.4 15.5

BNW1 102.1 96.8

BNW2 78.8 78.0

BNW3 60.3 53.6

BNW4 82.2 95.0

BNW5 69.8 97.5

BNW6 79.6 145.0

BNW7 9.6 139.5

BNW8 41.7 102.7

BNW9 30.7 77.4

BNW10 64.3 128.7

BNW11 70.1 120.9

BNW12 85.4 132.1

BNW13 3.9 14.4

BNW14 20.2 25.5

BNW15 50.4 56.9

BNW16 2.7 27.4

BNW17 88.2 120.1

BNW18 92.0 82.8

BNW19 51.1 73.6

BNW20 46.8 120.7

BNW21 48.9 121.6

BNW22 41.3 104.3

BNW23 85.1 132.7

BNW24 3.9 13.3

BNW25 2.9 13.9

BNW26 94.1 136.8 lnhibition analysis of BNW7 and BNW16 on 11β-HSD1 activity in intact, stably transfected HEK-293 cells

Compound BNW7 did not inhibit 11β-HSD2, 17β-HSD1 or 17β-HSD2. BNW16 inhibited 11β-HSD2 with an IC50 of 3.95 μM and 17β-HSD2 with an IC50 of 28.3 μM.

In intact HEK-293 cells transiently expressing 11β-HSD1, BNW7 is a more potent compound than BNW16, probably due to the carboxy group.

IC50 in IC50 in cell lysates intact cells

BNW7 2.03 ± 0.18 0.55 ± 0.05 BNW16 0.144 ± 0.027 2.32 ± 0.33

Fig. 2 shows inhibition of 11β-HSD1 by substance 7 (BNW7) and substance 16 (BNW16) in intact cells.

Preferred inhibitors 11β-HSD

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Claims

Claims

1. Use of an llβ-HSD inhibitor or a pharmaceutically acceptable salt thereof for the manufacture of a pharmaceutical agent for the prevention and/or treatment of metabolic diseases.

2. Use according to claim 1, wherein the inhibitor is selected from the group consisting of substances 16, 7, 13, 14, 24, 25, 1-6, 8-12, 15, 17- 23 or a compound of formula I₁ Il or HI.

3. Use according to claim 1 for the manufacture of a pharmaceutical agent for the prevention and/or treatment of obesity or insulin sensitivity.

4. Use according to any of claims 1 to 3 for the manufacture of a pharmaceutical agent for the prevention and/or treatment of diabetes type II.

5. Use of an llβ-HSD inhibitor or a pharmaceutically acceptable salt thereof for the manufacture of a pharmaceutical agent for the prevention and/or treatment of cancer and/or cell proliferation.

6. Use according to claim 5, wherein the inhibitor is selected from the group consisting of substances 16, 7, 13, 14, 24, 25, 1-6, 8-12, 15, 17-

23 or a compound of formula I, Il or III.

7. Use according to claim 5 or 6 for the manufacture of a pharmaceutical agent for the prevention and/or treatment of breast cancer.

8. Use of an llβ-HSD inhibitor or a pharmaceutically acceptable salt thereof for the manufacture of a pharmaceutical agent for the prevention and/or treatment of glaucoma.

9. Use according to claim 8, wherein the inhibitor is selected from the group consisting of substances 16, 7, 13, 14, 24, 25, 1-6, 8-12, 15, 17- 23 or a compound of formula I, Il or III.

10. Use of an llβ-HSD inhibitor or a pharmaceutically acceptable salt thereof for the manufacture of a pharmaceutical agent for the prevention and/or treatment of diseases associated with abnormal growth hormone secretion or for the manufacture of a pharmaceutical agent for the prevention and/or treatment of wound healing disorders.

11. Use according to claim 10, wherein the inhibitor is selected from the group consisting of substances 16, 7, 13, 14, 24, 25, 1-6, 8-12, 15, 17- 23 or a compound of formula I, Il or III.

12. Use according to any of the preceding claims, wherein the llβ-HSD inhibitor is selected from substances 16, 7, 13, 24 or 25.

13. A pharmaceutical composition comprising, as an active ingredient, an 11 β-HSD inhibitor or a salt thereof, wherein said llβ-HSD type 1 inhibitor is selected from the group consisting of the following formulas I to III:

wherein

X, Y and Z each independently represent halogen, in particular, F, Cl, or Br, CrC₆ alkyl, C₅-Ci₅ aryl or d-C₆ alkoxy, n represents an integer from 1 to 10, in particular, from 1 to 4, L represents an amide, amine, sulfonamide, ester, thioester or keto group, T, U, V and W each independently represent an oxo, thio, ketone, thioketone, Ci-C₆ alkyl or CrC₆ alkanol group, Ar represents an aromatic ring system, and Cyc represents a cyclic ring system, with the proviso that the compound is not substance 7,

wherein

A represents an OH, a C1-C10 ester (C1-C10 alkyl-CO-O-), a C1-C10 amide (C1-C10 alkyl-CO-NH-), a C1-C10 ether or a CrCio ketone (C1-C10 alkyl-CO-) group, B and C each independently represent an oxo group, a keto group, a

CrC₆ alkanol group or a CrC₆ alkyl group, m is an integer from 1 to 10, in particular, from 1 to 4, and D is a group selected from COOR¹ or CONR²R³, wherein R¹, R² and R³ each independently represent H or a CrC₆ alkyl group, with the proviso that the compound is not substance 16,

(III) wherein

E represents -OH, a CrCi₀ ester (C1-C10 alkyl-CO-O-)₍ a C-1-C10 amide

(C1-C10 alkyl-CO-NH-), a C1-C10 ether or a C1-C10 ketone (C1-C10 alkyl-

CO-) group,

F represents an oxo group, a keto group, a C₁-C₆ alkanol group or a d- C₆ alkyl group, and

G is is a group selected from COOR¹ or CONR²R³, wherein R¹, R² and

R³ each independently represent H or a C₁-C₂O hydrocarbon group, in particular, a C₁-C₆ alkyl group, with the proviso that the compound is not a compound of substance 24 or 25.