Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D487/00—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, not provided for by groups C07D451/00 - C07D477/00
  • C07D487/02—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, not provided for by groups C07D451/00 - C07D477/00 in which the condensed system contains two hetero rings
  • C07D487/04—Ortho-condensed systems
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K31/00—Medicinal preparations containing organic active ingredients
  • A61K31/33—Heterocyclic compounds
  • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
  • A61K31/495—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with two or more nitrogen atoms as the only ring heteroatoms, e.g. piperazine or tetrazines
  • A61K31/4985—Pyrazines or piperazines ortho- or peri-condensed with heterocyclic ring systems
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P19/00—Drugs for skeletal disorders
  • A61P19/02—Drugs for skeletal disorders for joint disorders, e.g. arthritis, arthrosis
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C309/00—Sulfonic acids; Halides, esters, or anhydrides thereof
  • C07C309/01—Sulfonic acids
  • C07C309/02—Sulfonic acids having sulfo groups bound to acyclic carbon atoms
  • C07C309/03—Sulfonic acids having sulfo groups bound to acyclic carbon atoms of an acyclic saturated carbon skeleton
  • C07C309/04—Sulfonic acids having sulfo groups bound to acyclic carbon atoms of an acyclic saturated carbon skeleton containing only one sulfo group
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C55/00—Saturated compounds having more than one carboxyl group bound to acyclic carbon atoms
  • C07C55/02—Dicarboxylic acids
  • C07C55/08—Malonic acid
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07B—GENERAL METHODS OF ORGANIC CHEMISTRY; APPARATUS THEREFOR
  • C07B2200/00—Indexing scheme relating to specific properties of organic compounds
  • C07B2200/13—Crystalline forms, e.g. polymorphs

Definitions

• the present invention relates to novel Rabeximod compounds. Furthermore, the present invention concerns pharmaceutical compositions comprising of the present Rabeximod compounds.
• the Rabeximod compounds selected from hydrochloric acid (HCI) salt, methanesulphonic acid salt and malonic acid salt of Rabeximod are particularly useful in treating a mammal, such as a human subject, suffering from or diagnosed with, for instance, rheumatoid arthritis.
• the compound known under the INN ‘Rabeximod’ has the IUPAC name 9- Chloro-2,3-dimethyl-6-(N,N-dimethylaminoethylamino-2-oxoethyl)-6H-indolo-[2,3- b]quinoxaline and has the following molecular structure.
• PCT/EP2021/065693 describes the use of Rabeximod (free base) in the treatment of acute respiratory syndrome, in particular acute respiratory syndrome associated with pathogenic infection, such as infection with influenza viruses, respiratory syncytial virus, filoviruses, arenaviruses and corona viruses.
• Rabeximod compounds that combine more favorable pharmacokinetic (‘PK’) properties, such as high (relative) bio-availability, low peak-and-th rough variations and/or low inter-patient variability, with good manufacturing, formulation and stability attributes.
• PK pharmacokinetic
• Good manufacturability typically means that the compounds can be easily obtained in high purity on a large scale and in an economically viable manner.
• compounds can easily be processed into the desired formulation(s), such as a solid oral dosage form but also other types of formulations, e.g.
• Drug compounds should possess sufficient chemical and/or physicochemical stability upon storage, both as a (bulk) drug compound and as a finished drug product, and be compatible with excipients.
• the present invention provides new Rabeximod compounds which meet said objective. More in particular, the present invention provides Rabeximod in the form of a salt, selected from the group consisting of hydrochloric acid salt, the methane sulphonic acid salt and the malonic acid salt.
• the present Rabeximod compounds have been found to possess substantially improved (oral) bio-availability in mice, as reflected by the increase in AUC, at equal dosages.
• the present Rabeximod compounds have been found to produce more favorable plasma profile, upon (single) oral administration, characterized by a more gradual decrease of the plasma concentration.
• the present Rabeximod compounds furthermore are considerably more water soluble than the freebase ( ⁇ 0.005 mg/ml). At the same time, the present Rabeximod compounds have low hygroscopocity and remain stable under exposure to variable humidity conditions.
• the present invention relates to a compound selected from the group consisting of a HCI salt, a methane sulphonic acid (mesylate) salt and a malonic acid salt of a compound of formula (I)
• the compound is a HCI salt.
• the compound is a methane sulphonic acid salt.
• the compound is a malonic acid salt.
• the compound of the invention is in a solid form, preferably a crystalline form, and in particular the salt is a polymorphic form.
• the compound is selected from a salt obtainable by the reaction of Rabeximod as free base with an acid selected from HCI, malonic acid and methane sulphonic acid.
• the compound is in solid and/or non-dissociated form, that is an amorphous form or a crystalline form. In another embodiment the compound is in a dissolved and/or dissociated form. In a further embodiment the compound is in crystalline form. In a still further embodiment, the compound is in a hydrated form.
• the compound is selected from the salts obtainable by a reaction of Rabeximod as free base with an acid selected from HCI, malonic acid and methane sulfonic acid.
• the compound is a HCI salt in crystalline form, more preferably a HCI salt in a crystalline form that is characterized by the following XRPD peaks:
• the compound is a methane sulphonic acid salt in crystalline form, more preferably a methane sulphonic acid salt in a crystalline form that is characterized by the following XRPD peaks:
• the compound is a malonic acid salt in crystalline form, more preferably a malonic acid salt in a crystalline from that is characterized by the following XRPD peaks:
• the compound is obtainable by a process comprising: a) combining, in a liquid or solvent, HCI, methane sulphonic acid or malonic acid with Rabeximod free base, to produce a solution or a suspension of the corresponding salt; b) obtaining the salt as a solid by precipitation or crystallization, such as by cooling, evaporation of solvent, addition of an antisolvent or addition to an antisolvent, or by addition of a co-crystallizing agent, followed by filtration or centrifugation and optionally purifying the salt.
• the salt is obtainable by the process as described in the experimental section herein.
• Each of the compounds of the present invention has a solubility in water at room temperature of above 0.3 mg/ml. Some of the compounds have a solubility in water at room temperature of at least 5 mg/ml, such as from 5-15 mg/ml.
• the present invention relates to a composition
• a composition comprising a compound of the present invention, such as a compound according to any one of the above described embodiments.
• said composition comprises the compound in solid and/or non-dissociated form, e.g. in case the composition is a bulk powder, a granulate or a solid finished dosage form.
• said composition comprises the salt in dissolved and/or dissociated form, e.g. in case the composition is a liquid finished dosage form or an aqueous solution formed and/or used in the production of solid dosage forms or the like.
• the present invention relates to a pharmaceutical composition
• a pharmaceutical composition comprising a compound of the present invention, such as a compound according to any one of the above-described embodiments, and optionally a pharmaceutically acceptable additive.
• the present invention relates to a compound of the present invention, such as a compound according to any one of the above described embodiments, for use in a method of treating a mammal, preferably a human subject, in need thereof, such as a human subject suffering from or diagnosed with rheumatoid arthritis, preferably moderate rheumatoid arthritis, severe rheumatoid arthritis or moderate to severe rheumatoid arthritis or a human subject suffering from acute respiratory syndrome that may be associated with pathogenic infection.
• the present invention relates to a compound of the present invention, such as a compound according to any one of the above-described embodiments, for use in a method of treating rheumatoid arthritis, preferably moderate rheumatoid arthritis, severe rheumatoid arthritis or moderate to severe rheumatoid arthritis or for treating acute respiratory syndrome that may be associated with pathogenic infection, in a mammal, such as a human subject in need thereof.
• the present invention relates to a method for treatment of a mammal, preferably a human subject, in need thereof, such as a human subject suffering from or diagnosed with rheumatoid arthritis, preferably moderate rheumatoid arthritis, severe rheumatoid arthritis or moderate to severe rheumatoid arthritis or a human subject suffering from acute respiratory syndrome that may be associated with pathogenic infection, comprising administering to the mammal a compound of the present invention, such as a salt according to any one of the above described embodiments.
• the present invention relates to a method of treating rheumatoid arthritis, preferably moderate rheumatoid arthritis, severe rheumatoid arthritis or moderate to severe rheumatoid arthritis or a method of treating acute respiratory syndrome that may be associated with pathogenic infection, in a human subject, comprising administering to the mammal a compound of the present invention, such as a salt according to any one of the above-described embodiments.
• Rabeximod refers to the terms “Rabeximod”, “rabeximod” and “9-Chloro-2,3-dimethyl-6-(N,N-dimethylaminoethylamino-2-oxoethyl)-6H-indolo-[2,3- b]quinoxaline” may be used interchangeably and mean the compound in any solid form or liquid form unless otherwise indicated or implied under the given circumstances.
• Rabeximod can be obtained from the process as described in EP1756111A1 and US2005/288296, and then purified and isolated. Furthermore, Rabeximod free base as crystalline form may be obtained as described in European Patent application no. 20179279.3 (not published)
• counterion means an acid counterion which forms a salt with the protonated Rabeximod free base.
• a Rabeximod salt When a Rabeximod salt is described herein it may be referred to using a three-letter code which identifies the counterion. The table below lists and defines each of the specific 3-letter codes used in this document. The use of the 3-letter code identifies the salt of Rabeximod, such as the hydrochloric acid salt of Rabeximod is indicated by the code HCI.
• the description of a Rabeximod salt, such as HCI comprises the salt in any form, such as solid, amorphous, dissolved, or polymorphic.
• compositions and particularly pharmaceutical compositions as herein disclosed may, in addition to the compounds herein disclosed, further comprise at least one pharmaceutically acceptable adjuvant, diluent, excipient and/or carrier.
• pharmaceutically acceptable adjuvant, diluent, excipient and/or carrier may without limitation be selected from the group consisting of Oleic acid, Tween 80, sodium carboxy methylcellulose.
• the pharmaceutical compositions comprise from 1 to 99 weight % of said at least one pharmaceutically acceptable adjuvant, diluent, excipient and/or carrier and from 1 to 99 weight % of a compound of formula I as herein disclosed.
• the combined amount of the active ingredient and of the pharmaceutically acceptable adjuvant, diluent, excipient and/or carrier may not constitute more than 100% by weight (100 %w/w) of the composition, particularly the pharmaceutical composition.
• the composition is preferably provided in the form of a unit dosage form.
• unit dosage form refers to a physically discrete unit suitable as a unitary dosage for human subjects, each unit containing a predetermined quantity of active material calculated to produce the desired therapeutic effect in association with any suitable pharmaceutical camer(s) and/or excipient(s).
• exemplary, non-limiting unit dosage forms include a tablet (e.g., a chewable tablet), caplet, capsule (e.g., a hard capsule or a soft capsule), etc.
• the unit dosage form is a unit dosage form that is suitable for oral administration. Most preferably, it is a solid unit dosage form, such as a tablet or capsule, most preferably a capsule, such as a standard gelatin capsule, which is filled with a powder as defined herein elsewhere.
• the present rabeximod compounds may be provided in the form of a liquid oral formulation.
• Liquid oral formulations are a preferred or required oral dosage form for patients that have difficulty swallowing. Liquid oral formulations require a stable, dissolved, or suspended form of the drug that meets release, bioavailability, stability and taste requirements.
• the present rabeximod compounds may be provided in the form of a sterile liquid suitable for parenteral administration, such as administration by iv injection or infusion.
• parenteral formulations may be the preferred or required dosage form for patients suffering severe respiratory conditions, e.g. patients that are intubated and kept in an induced coma.
• Sterile parenteral formulations require a stable, dissolved, or suspended form of the drug that meets release, bioavailability, and stability requirements.
• the present invention also relates to methods of treating a subject in need thereof, said treatment comprising the administration to said subject of a Rabeximod compound of the present invention, preferably a composition, formulation or unit dosage form comprising said rabeximod compound, as defined herein.
• the subject to be treated is a human subject, preferably a human.
• the present invention also relates to methods of treating a subject suffering from and/or diagnosed with rheumatoid arthritis, or a related condition, wherein the methods comprise the administration of a rabeximod compound of the instant invention.
• the present invention also relates to methods of treating a subject suffering from an acute respiratory syndrome, optionally associated with a pathogenic infection, such as a corona virus infection, wherein the methods comprise the administration of a rabeximod compound of the instant invention.
• treatment means the management and care of a patient for the purpose of combating a condition, such as a disease or a disorder.
• the term is intended to include the full spectrum of treatments for a given condition from which the patient is suffering, such as administration of the active compound to alleviate the symptoms or complications, to delay the progression of the disease, disorder or condition, to alleviate or relief the symptoms and complications, and/or to cure or eliminate the disease, disorder or condition as well as to pre-vent the condition, wherein prevention is to be understood as the management and care of a patient for the purpose of combating the disease, condition, or disorder and includes the administration of the active compounds to prevent the onset of the symptoms or complications.
• the treatment may either be performed in an acute or in a chronic way.
• the patient to be treated is preferably a mammal; in particular, a human being, but it may also include animals, such as dogs, cats, cows, sheep and pigs.
• pharmaceutically acceptable additive is intended without limitation to include carriers, excipients, diluents, adjuvant, colorings, aroma, preservatives etc. that the skilled person would consider using when formulating Rabeximod in order to make a pharmaceutical composition.
• the adjuvants, diluents, excipients and/or carriers that may be used in the composition of the invention must be pharmaceutically acceptable in the sense of being compatible with Rabeximod and the other ingredients of the pharmaceutical composition, and not deleterious to the recipient thereof. It is preferred that the compositions shall not contain any material that may cause an adverse reaction, such as an allergic reaction.
• the adjuvants, diluents, excipients and carriers that may be used in the pharmaceutical composition of the invention are well known to a person within the art.
• Figures 1 illustrates the XRPD Diffractogram for the crystalline HCI salt form prepared.
• Figures 2 illustrates XRPD Diffractogram for the crystalline Mao salt form prepared.
• Figures 3 illustrates XRPD Diffractogram for the crystalline Mes salt form prepared.
• Figure 4 shows temperature profiles which were applied in the methanesulfonic acid salt crystallization experiments. The temperature was changed between 5-50°C at a rate of 0.17°C/min. The initial and final temperature was 25°C.
• Figure 5 shows temperature profiles which were applied in the hydrochloride acid and malonic acid salt crystallization experiments.
• the temperature was changed between 5-50°C at a rate of 0.17°C/min.
• the initial and final temperature was 25°C.
• Figure 6 shows TGMS analysis between 25-300°C (heating rate 10°C/min) of the Mes salt (Exp. ID: TCS35). A mass loss of 4.9% was measured between 25-220°C.
• Figure 7 shows DSC trace between 25-300°C (heating rate 10°C/min) of the Mes salt (Exp. ID: TCS35). The endothermic event between RT-110°C may be attributed to loss of water. Melting of the API may be associated to the sharp endothermic event at 257°C.
• Figure 8 shows LCMS chromatogram of the Mes salt (Exp. ID: TCS35).
• the API had a retention time of 1.66 min.
• the MS spectrum confirmed the molecular mass of the compound of 409.9 g/mol with [M+H]+ ions of m/z 410.3.
• Figure 9 shows 1 H-NMR spectrum of the Mes salt (Exp. ID: TCS35, top) and the freebase (SM, top) measured in DMSO-d 6 .
• water 3.4 ppm
• DMSO 2.5 ppm
• methanesulfonic acid CH 3 at 2.53 ppm and OH at 9.3 ppm
• Figure 10 shows 13 C-NMR-APT spectrum of the Mes salt (Exp. ID: TCS35) measured in DMSO-cfe.
• the CH and CH 3 groups are positive signals whereas the CH 2 and quaternary carbons are negative signals.
• signals of methanesulfonic acid and DMSO are present.
• Figure 11 A and B shows Moisture Sorption Kinetic (A) and isotherm (B) plots for the Mes salt (Exp. ID: TCS35) with a first sorption cycle from 40%RH to 95% RH followed by desorption from 95% RH to 0% RH and sorption from 0%RH to 40% RH in steps of 10% RH with a minimum stage time of 10 min and maximum stage time of 6 hours.
• Figure 12 shows TGMS analysis between 25-300°C (heating rate 10°C/min) of the HCI salt (Exp. ID: TCS160). Approximately 0.3% mass loss was recorded between ⁇ 25-80°C. The endothermic event at 285°C most likely denotes melting.
• Figure 13 shows DSC trace between 25-300°C (heating rate 10°C/min) of the HCI salt (Exp. ID: TCS160). Melting of the API may be associated to the sharp endothermic event at 294°C.
• Figure 14 shows 1 H-NMR spectrum of the HCI salt (Exp. ID: TCS160).
• signals of DMSO-d 6 , 2-propanol and TMS were detected.
• Figure 15A and B shows Moisture Sorption Kinetic (A) and isotherm (B) plots for the HCI salt (Exp. ID: TCS160) with a first sorption cycle from 40%RH to 95% RH followed by desorption from 95% RH to 0% RH and sorption from 0%RH to 40% RH in steps of 10% RH with a minimum stage time of 10 min and maximum stage time of 6 hours.
• XRPD patterns were obtained using a high-throughput XRPD set-up.
• the plates were mounted on a Bruker General Area Detector Diffraction System (GADDS) equipped with a VANTEC-500 gas area detector corrected for intensity and geometric variations.
• GADDS General Area Detector Diffraction System
• the calibration of the measurement accuracy (peaks position) was performed using NIST SRM1976 standard (Corundum).
• the HR-XRPD data were collected on D8 Advance diffractometer using Cu K ai radiation (1.54056 A) with germanium monochromator at RT. Diffraction data were collected in the 20 range 2 - 41 .5° 20 . Detector scan on solid state LynxEye detector was performed using 0.015° per step with 10 sec/step scan speed. The samples were measured in 8 mm long glass capillary with 0.5 mm outer diameter.
• Mass loss due to solvent or water loss from the crystals was determined by TGA/DSC. Monitoring the sample weight, during heating in a TGA/DSC 3+ STARe system (Mettler-Toledo GmbH, Switzerland), resulted in a weight vs. temperature curve and a heat flow signal.
• the TGA/DSC 3+ was calibrated for temperature with samples of indium and aluminum. Samples (circa 1 mg) were weighed in 100 pL aluminum crucibles and sealed. The lids were pin-holed, and the crucibles heated in the TGA from 25 to 300°C at a heating rate of 10°C/min. Dry N 2 gas was used for purging.
• the gases coming from the TGA samples were analyzed by a mass spectrometer Omnistar GSD 301 T2 (Pfeiffer Vacuum GmbH, Germany).
• the latter is a quadrupole mass spectrometer, which analyzes masses in the temperature range of 0-200 amu.
• the cycling DSC’s were measured in standard 40 pL aluminum pans, pin-holed and heated in the DSC from 25°C to variable temperatures, then cooled back to 25°C.
• the heating and cooling rate was 10°C/min.
• Dry N 2 gas, at a flow rate of 50 mL/min was used to purge the DSC equipment during measurement. After the experiments, the solids were removed from the pans and analyzed by HT-XRPD.
• the polarized light microscopy pictures were collected with a Leica DM 2500M optical microscope. The sample was mounted on a glass slide and measured as a dry solid.
• the peak area percentage of the compound of interest is employed as an indication of the purity of the component in the sample.
• a solution of Rabeximod (SM) was measured as a reference and the peak area was assigned to 100% recovery after taking into account the amount of solvent determined by TGMS.
• Samples of the salts were measured in the same way and the % recovery was calculated again by taking into account the amount of solvent. With all measured salts, ⁇ 100% recovery could be assigned to the API and the remaining % recovered could be assigned to the counterion from which the ratio APkcounterion could be determined.
• Differences in hygroscopicity (moisture uptake) of the various forms of a solid material provided a measure of their relative stability at increasing relative humidity.
• Moisture sorption isotherms of small samples were obtained using a DVS-1 system from Surface Measurement Systems (London, UK); this instrument is suitable for use with a few milligrams of sample, with an accuracy of 0.1 pg.
• the relative humidity was varied during sorption-desorption-sorption (40-95-0-40% RH) at a constant temperature of 25°C. Weight equilibration per step was set at dm/dt ⁇ 0.0002 mg/min for a minimum of 1 hour or maximum of 6 hours. Afterwards the sample was measured by HT-XRPD.
• the hygroscopicity was classified according to the European Pharmacopoeia Hygroscopicity classification. Water uptake percentage at 25°C/80%RH (24h) is:
• Form T A specific crystalline form of Rabeximod free base was designated ‘Form T.
• Form 1 was an anhydrous material melting at 260°C. The chemical purity of the starting material was high as determined by 1 H-NMR and LCMS. Form 1 was slightly hygroscopic and remained physically stable upon exposure to relative humidity values between 0-95%.
• a set of 1.8 ml vials were prepared each containing 20 mg of Rabeximod free base. To each vial, a magnetic stir bar was added and 1.1 eq. of a selected acid. The acids were added as 1 M or 2M aqueous solutions. In addition, a set of 1.8 ml vials were prepared containing API only. After that, 750 pl of a selected solvent was added. The vials were transferred to a Crystal 16TM parallel crystallizer and the suspensions were stirred at 750 rpm. The experiments involving methanesulfonic acid, was subjected to a temperature profile depicted in Figure 4. A slightly different temperature profile was applied for Hydrochloric acid and Malonic acid (Figure 5).
• the temperature was set from 50°C immediately to 25°C. After reaching 25°C, the mixtures were incubated without stirring for 3 days at 25°C.
• the suspensions were subjected to centrifugation and the solids were isolated, dried under vacuum (50°C, 5 mbar, 18h) and analyzed by HT-XRPD.
• the solvents from experiments in which no suspensions were obtained were completely evaporated.
• the mother liquors from most experiments in which a solid was formed were also evaporated to dryness.
• the resulting solids of the solvent evaporations were analyzed by HT-XRPD.
• AAC refers to Accelerated aging conditions (3 days at 40°C and 75% RH).
• Table 3 shows an overview of the salt forms obtained in the present study.
• the solubility of the salts in water at RT was estimated by adding water to the salt until the salt dissolved. All salts showed higher solubilities than the freebase ( ⁇ 0.005 mg/ml), as indicated by the way that the salts interacted with water. The freebase showed no sign of dissolution whereas all salts became a good solution in water. From the TGMS data it was estimated whether the salts are stochiometric hydrates or not.
• the preparation of selected salts was performed at a larger scale to obtain additional material for further analytical characterization.
• the experiments were started either with 100 mg (1 st set) or with 1200 mg (2 nd set) of Rabeximod free base (Form 1 , starting material).
• the starting material was weighed into 8 ml vials which contained magnetic stir bars.
• the 1200 mg experiments were performed in a 100 ml Mettler Toledo MultiMaxTM crystallization setup which was equipped with overhead stirrers.
• the selected acids were added as 1 M or 2M aqueous solutions. After that, the selected solvent was added and stirring was applied at a stirring rate of 750 rpm.
• the stirred suspensions were subjected to a temperature profile like the profile described in figure 5 but with a final 9-hour incubation period at 25°C.
• the suspensions were filtered using vacuum filtration in combination with a Buchner funnel.
• the solids were dried under ambient conditions for 18h and a sample was measured by XRPD.
• the solids obtained from experiments TCS32-34 and TCS36 were further dried for 18h at 50°C and 5 mbar.
• the solids obtained from experiment TCS35 were further dried for 4 days at RT and 200 mbar whereas the solids obtained from experiment TCS37 were further dried for 4 days at 50°C and 5 mbar.
• Table 4 a 4 days at RT and 200 mbar; b 1 day at RT and 5 mbar.
• solubility of a selection of salts from the salt screen was estimated at room temperature in water. To approximately 2 mg of salt, solvent aliquots were added in steps of 50 pl until the material was dissolved as observed visually by the naked eye. Quantitative solubility determination
• thermodynamic solubility of Rabeximod free base was determined in 3 different USP buffers (50 mM) ranging from pH 1.2 to pH 7.4 and in water (Exp. ID: QSA21-24) by the shake-flask method at 25°C (
• the solubility of the freebase (Form 1) and salts prepared by scale-up was determined in water at room temperature. Suspensions were stirred for 18h after which the liquid phase was isolated and measured by LCMS against a calibration line. The solids were dried and measured by XRPD to determine the solid form. The results are summarized in the table below. The lowest solubility was determined for the freebase (Form 1). The signal was lower than the calibration line and therefore the solubility was determined to be ⁇ 0.005 mg/ml. The two anhydrous salts Mao1 and HCI1 had a solubility of 5.3 mg/ml and 5.5 mg/ml in water, respectively. The highest solubility was tested for Mes1 showing solubility of 13.3 mg/ml.
• IV formulations were prepared on the day of dosing. The formulations were prepared by weighing the compound into brown glass vial; on the day of dosing ClinOleic 20 % intravenous fat emulsion (200 pg/mL, Tamro) was added into tubes (1 ,5 mg/mL in 20 % ClinOleic). Formulations were homogenized 5 minutes before dosing. IV formulations were administered within 5 hours after preparation.
• PO formulations were prepared day before administration.
• the formulations were prepared by formulating the test items in PO vehicle (6 mg/ml in 0.45 % (v/v) Tween 80 - 0.11 % (w/v) sodium carboxy methylcellulose (CMC) in tap water).
• the suspensions were mixed with vortex and stored refrigerated (+4 °C) over night. On the day of dosing formulations were homogenized 15 minutes before dosing. Animal experiment
• Naive animals were used in the study (see Table 6). They were housed in individually ventilated (IVC)-cages in groups of six mice. The cages were provided with aspen bedding (4HP and PM90L, Tapvei, Estonia) and paper strands (Sizzlenest, Datesand, UK) as nesting material, and a paper pulp cabin and red polycarbonate cylinder (Datesand, UK) as cage enrichment. The temperature (22 ⁇ 2°C), humidity (55 ⁇ 10 %) and air exchange rate (75 times/h) of the IVC-cages and 12/12-h light/dark cycle (500 lux lighting on at 6 a.m., 1 .5 lux lighting on at 6 p.m.) of the animal holding room were automatically controlled and maintained.
• IVC individually ventilated
• Study compounds were administered via the specified route and the times of dosing and blood sampling were recorded. Within 30 min following the sampling, the blood was centrifuged for plasma separation (room temperature; 10 min; 2700 G). The plasma samples were transferred into plastic tubes, frozen and stored at -20°C until analysis. Clinical signs and general behavior of the animals were recorded, when necessary.
• the pharmacokinetic parameters were calculated using Phoenix 64 (Build 6.4.0.768) WinNonlin (version 6.4) software, using non-compartmental methods (NCA). Nominal doses were used for all animals.
• the terminal phase half-life (TI /2 ) was calculated by least-squares regression analysis of the terminal linear part of the log concentration-time curve.
• the area under the plasma concentration- time curve (AUC) was determined with the linear trapezoidal rule for increasing values and log trapezoidal rule for decreasing values up to the last measurable concentration (AUC 0 - iast), and extrapolation of the terminal elimination phase to infinity was used when possible; the following criteria were used:
• C ma x The maximum plasma concentration (C ma x) and the time to reach C ma x (tmax) were derived directly from the plasma concentration data.
• Rabeximod HCI at 30.0 mg/kg, plasma concentrations peaked at 4.00 h post-dose with the mean Cmax of 893 ng/ml.
• the value for AUCo-iast was 13 700 h*ng/ml.
• Rabeximod Mao at 30.0 mg/kg, plasma concentrations peaked at 0.17 h post-dose with the mean Cmax Of 1140 ng/ml.
• the value for AUCo-iast was 11 400 h*ng/ml.

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