Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D207/00—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom
  • C07D207/02—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom
  • C07D207/30—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having two double bonds between ring members or between ring members and non-ring members
  • C07D207/32—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having two double bonds between ring members or between ring members and non-ring members with only hydrogen atoms, hydrocarbon or substituted hydrocarbon radicals, directly attached to ring carbon atoms
  • C07D207/33—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having two double bonds between ring members or between ring members and non-ring members with only hydrogen atoms, hydrocarbon or substituted hydrocarbon radicals, directly attached to ring carbon atoms with substituted hydrocarbon radicals, directly attached to ring carbon atoms
  • C07D207/333—Radicals substituted by oxygen or sulfur atoms
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P3/00—Drugs for disorders of the metabolism
  • A61P3/08—Drugs for disorders of the metabolism for glucose homeostasis
  • A61P3/10—Drugs for disorders of the metabolism for glucose homeostasis for hyperglycaemia, e.g. antidiabetics
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
  • A61P31/04—Antibacterial agents
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P35/00—Antineoplastic agents
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D207/00—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom
  • C07D207/02—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom
  • C07D207/30—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having two double bonds between ring members or between ring members and non-ring members
  • C07D207/32—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having two double bonds between ring members or between ring members and non-ring members with only hydrogen atoms, hydrocarbon or substituted hydrocarbon radicals, directly attached to ring carbon atoms
  • C07D207/33—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having two double bonds between ring members or between ring members and non-ring members with only hydrogen atoms, hydrocarbon or substituted hydrocarbon radicals, directly attached to ring carbon atoms with substituted hydrocarbon radicals, directly attached to ring carbon atoms
  • C07D207/335—Radicals substituted by nitrogen atoms not forming part of a nitro radical
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D207/00—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom
  • C07D207/02—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom
  • C07D207/30—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having two double bonds between ring members or between ring members and non-ring members
  • C07D207/34—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having two double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D249/00—Heterocyclic compounds containing five-membered rings having three nitrogen atoms as the only ring hetero atoms
  • C07D249/02—Heterocyclic compounds containing five-membered rings having three nitrogen atoms as the only ring hetero atoms not condensed with other rings
  • C07D249/04—1,2,3-Triazoles; Hydrogenated 1,2,3-triazoles
  • C07D249/06—1,2,3-Triazoles; Hydrogenated 1,2,3-triazoles with aryl radicals directly attached to ring atoms
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D257/00—Heterocyclic compounds containing rings having four nitrogen atoms as the only ring hetero atoms
  • C07D257/02—Heterocyclic compounds containing rings having four nitrogen atoms as the only ring hetero atoms not condensed with other rings
  • C07D257/04—Five-membered rings

Definitions

• the present invention relates to a novel class of chemical compounds and to their use in medicine.
• the invention concerns novel tetracycline derivatives, methods for their preparation, pharmaceutical compositions containing them and their use as antibiotic agents.
• Tetracycline derivatives are known for treating bacterial infections. However, there remains a need for tetracycline derivatives for the treatment of Gram- positive, Gram-negative and community acquired infections. Moreover, there remains a need for tetracycline derivatives effective against tetracycline resistant strains.
• the present invention provides compounds of formula (I):
• A represents an aromatic 5 membered heterocycle, optionally containing, in addition to the nitrogen atom indicated in formula (I), one to three additional nitrogen atoms and optionally substituted by one or more groups "R" selected from halogen,
• -NRaRb C ⁇ . 6 alkyl, C 2 . 6 alkenyl, C . 6 alkynyl, aryl, heteroaryl, hydroxy, -OC ⁇ - 6 alkyl, formyl, cyano, trifluoromethyl, -CHNORa, -CO 2 Ra, -CONRaRb,
• Ra and Rb independently represent hydrogen or C ⁇ - 6 alkyl (preferably methyl);
• R 1 represents hydrogen, C ⁇ . 6 alkyl or together R 1 and R 3 represent a CH 2 moiety;
• R 2 represents hydrogen, -OC ⁇ - 6 alkyl, -O(O)C ⁇ - 6 alkyl or hydroxy;
• R represents hydrogen, hydroxy or together R and R represent a CH 2 moiety; and pharmaceutically acceptable derivatives and solvates thereof.
• pharmaceutically acceptable derivative refers to any pharmaceutically acceptable salt, or metabolically labile derivative of a compound of formula (I), for example a derivative of an amine group, which, upon administration to the recipient, is capable of providing (directly or indirectly) a compound of formula (I).
• compounds of formula (I) may be modified to provide pharmaceutically acceptable derivatives thereof at any of the functional groups in the compounds of formula (I).
• Such derivatives are clear to those skilled in the art, without undue experimentation, and with reference to the teaching of Burger's Medicinal Chemistry And Drug Discovery, 5th Edition, Vol 1 : Principles And Practice, which is incorporated herein by reference.
• compounds of formula (I) may be N-alkylated in the presence of formaldehyde and an amine such as methylamine to give the corresponding Mannich base adducts.
• Salts and solvates of compounds of formula (I) which are suitable for use in medicine are those wherein the counterion or associated solvent is pharmaceutically acceptable.
• salts and solvates having non-pharmaceutically acceptable counterions or associated solvents are within the scope of the present invention, for example, for use as intermediates in the preparation of other compounds of formula (I) and their pharmaceutically acceptable derivatives, and solvates.
• Suitable salts according to the invention include those formed with both organic and inorganic acids or bases.
• Pharmaceutically acceptable acid addition salts include those formed from trifluoroacetic, hydrochloric, hydrobromic, hydroiodoic, sulphuric, citric, tartaric, phosphoric, lactic, pyruvic, acetic, succinic, oxalic, fumaric, maleic, oxaloacetic, methanesulphonic, ethanesulphonic, p-toluenesulphonic, benzenesulphonic, and isethionic acids.
• Pharmaceutically acceptable base salts include ammonium salts, alkali metal salts such as those of sodium and potassium, alkaline earth metal salts such as those of calcium and magnesium and salts with organic bases such as dicyclohexyl amine and N-methyl-D-glucamine.
• Suitable solvates according to the invention include hydrates.
• alkyl refers to a saturated straight or branched alkyl chain containing from 1 to 6 carbon atoms.
• examples of such groups include without limitation methyl, ethyl, n-propyl, isopropyl, n-butyl, wo-butyl, sec-butyl, tert-butyl, neopentyl and hexyl.
• alkenyl refers to a straight or branched alkenyl chain containing from 2 to 6 carbon. Examples of such groups include without limitation 1- ethenyl, 1- propenyl, allyl(2-propenyl), 1-butenyl, 2-butenyl, 2- pentenyl.
• alkynyl refers to a straight or branched alkynyl chain containing from 3 to 6 carbon. Examples of such groups include without limitation propynyl, butynyl or pentynyl.
• cycloalkyl refers to a saturated alkyl ring containing from 3 to 6 carbon atoms. Examples of such groups include cyclopropyl, cyclobutyl, cyclopentyl and cyclohexyl.
• halogen refers to a fluorine, chlorine, bromine or iodine atom.
• the halogen atom is selected from chlorine, bromine or iodine, preferably chlorine or bromine. Chlorine is most preferred.
• aryl group refers to an aromatic mono or bicyclic ring system comprising from 5 to 10 carbon atoms and heteroaryl group is wherein one or more of the carbon atoms is/are replaced by heteroatoms independently selected from nitrogen, oxygen and sulfur,
• A represents pyrrole, pyrazole, 1,2,3-triazole, 1 ,2,4-triazole and tetrazole.
• Preferred substituents on A include ethoxycarbonyl, carboxaldehyde, cyano, dimethylaminomethyl, oxime and methyloxime.
• R 2 is selected from hydrogen, methoxy and hydroxy. More suitably, R is selected from hydrogen and hydroxy. Conveniently, R is hydroxy. Preferably, R is hydrogen. Suitably, R represents hydrogen or methyl. Conveniently R is methyl. Preferably R 3 is hydrogen
• the compound of formula (I) is derivatised from a natural tetracycline like compound.
• natural tetracycline like compounds include tetracycline, chlortetracycline, oxytetracycline, demeclocycline, methacycline, sancycline, doxycycline, and minocycline.
• the natural tetracycline like compound is selected from sancycline and doxycycline, most preferably sancycline.
• Examples of compounds of Formula (I) include:
• the compounds of the present invention show activity against the most important pathogens, including gram positive bacteria such as S. pneumoniae and S aureus, and gram negative organisms such as H influenzae, M. catarrhalis and E. coli.
• these compounds are active against gram positive and gram negative tetracycline resistant bacterial strains, including those with resistance mediated by efflux pumps and ribosome protection.
• the present invention provides a method for the treatment of a tetracycline compound responsive state in a subject, preferably a human, which comprises administering to the subject an effective amount of a compound of formula (I) or pharmaceutically acceptable derivative or solvate thereof.
• a compound of formula (I) or a pharmaceutically acceptable derivative or solvate thereof for use in medical therapy, particularly, for use in the manufacture of a medicament for the treatment of a tetracycline compound responsive state.
• tetracycline compound responsive state includes a state which can be treated, prevented, or otherwise ameliorated by the administration of a compound of formula (I) or pharmaceutically acceptable derivative or solvate thereof.
• Tetracycline compound responsive states include bacterial infections (including those which are resistant to other tetracycline compounds), cancer, diabetes, and other states for which tetracycline compounds have been found to be active (see, for example, U.S. Patent Nos. 5,789,395; 5,834,450; and 5,532,227).
• Compounds of the invention can be used to prevent or control important human and veterinary diseases such as respiratory tract infections, systemic infections and some local infections. More particulalry, compounds of the invention can be used to prevent or control diarrhoea, urinary tract infections, infections of skin and skin structure, ear, nose and throat infections, wound infection, mastitis and the like.
• tetracycline compounds of the invention are also included (van der Bozert et al., Cancer Res., 48:6686-6690 (1988)).
• the tetracycline compound is used to treat a bacterial infection.
• the tetracycline compound is used to treat a bacterial infection that is resistant to other tetracycline antibiotic compounds.
• the term 'treatment' as used herein includes prophylactic therapy.
• Bacterial infections may be caused by a wide variety of gram positive and gram negative bacteria.
• the compounds of formula (I) are useful as antibiotics against organisms which are resistant to other tetracycline compounds.
• the antibiotic activity of the compounds of formula (I) may be determined using the method discussed in the Biological Example below, or by using the in vitro standard broth dilution method described in Waitz, J.A., National Committee for Clinical Laboratory Standards, Approved Standard M7-T2, vol. 10, no. 8, pp. 13-20, 2 nd edition, Villanova, PA (1990).
• the compounds of the invention may also be used to treat infections traditionally treated with tetracycline compounds such as, for example, rickettsiae; a number of gram-positive and gram-negative bacteria; and the agents responsible for lymphogranuloma venereum, inclusion conjunctivitis and psittacosis.
• the compounds of formula (I) may be used to treat infections of pneumococci, Salmonella, E. coli, S. aureus or E. faecalis.
• the term "effective amount of the compound of formula (I)" is that amount necessary or sufficient to treat or prevent a tetracycline compound responsive state.
• the effective amount can vary depending on such factors as the size and weight of the subject, the type of illness, or the particular tetracycline compound.
• One of ordinary skill in the art would be able to study the aforementioned factors and make the determination regarding the effective amount of the compound of formula (I) or a pharmaceutically acceptable derivative or solvate thereof without undue experimentation.
• the invention also pertains to methods of treatment against micro- organism infections and associated diseases.
• the methods include administration of an effective amount of one or more compounds of formula (I) or a pharmaceutically acceptable derivative or solvate thereof to a subject.
• the subject is a mammal e.g., a human.
• a compound of the formula (I) can be administered as raw drug substance, but will generally be administered in admixture with a pharmaceutically acceptable carrier selected with regard to the intended route of administration and standard pharmaceutical practice.
• the present invention further provides a pharmaceutical formulation comprising a compound of formula (I) or a pharmaceutically acceptable derivative or solvate thereof, and one or more pharmaceutically acceptable carriers.
• pharmaceutically acceptable carrier includes substances capable of being coadministered with the compounds of formula (I), and which allow performance of the intended function, e.g., treat or prevent a tetracycline compound responsive state.
• Suitable pharmaceutically acceptable carriers include but are not limited to water, salt solutions, alcohol, vegetable oils, polyethylene glycols, gelatin, lactose, amylose, magnesium stearate, talc, silicic acid, viscous paraffin, perfume oil, fatty acid monoglycerides and diglycerides, petroethral fatty acid esters, hydroxymethyl- cellulose, polyvinylpyrrolidone, etc.
• the pharmaceutical preparations can be sterilised and if desired mixed with auxiliary agents, e.g., lubricants, preservatives, stabilisers, wetting agents, emulsifiers, salts for influencing osmotic pressure, buffers, colourings, flavourings and/or aromatic substances and the like which do not deleteriously react with the compounds of the invention.
• auxiliary agents e.g., lubricants, preservatives, stabilisers, wetting agents, emulsifiers, salts for influencing osmotic pressure, buffers, colourings, flavourings and/or aromatic substances and the like which do not deleteriously react with the compounds of the invention.
• the compounds of the invention may be administered alone or in combination with pharmaceutically acceptable carriers or diluents.
• the compounds of the invention may be administered via oral, parenteral or topical routes. The administration may be carried out in single or multiple doses.
• the compounds of the invention may be administered in a wide variety of different dosage forms, for example they may be combined with various pharmaceutically acceptable inert carriers in the form of tablets, capsules, lozenges, troches, hard candies, powders, sprays, creams, salves, suppositories, jellies, gels, pastes, lotions, ointments, aqueous suspensions, injectable solutions, elixirs, syrups, and the like.
• Such carriers include solid diluents or fillers, sterile aqueous media and various non-toxic organic solvents, etc.
• oral pharmaceutical compositions may be sweetened and/or flavoured.
• the compounds of the invention are present in such dosage forms at concentration levels ranging from about 5.0% to about 70% by weight.
• tablets may contain various excipients such as microcrystalline cellulose, sodium citrate, calcium carbonate, dicalcium phosphate and glycine may be employed along with various disintegrants such as starch (and preferably corn, potato or tapioca starch), alginic acid and certain complex silicates, together with granulation binders like polyvinylpyrrolidone, sucrose, gelatin and acacia. Additionally, lubricating agents such as magnesium stearate, sodium lauryl sulphate and talc may be employed. Solid compositions of a similar type may also be employed as fillers in gelatin capsules; preferred materials in this connection also include lactose or milk sugar as well as high molecular weight polyethylene glycols.
• excipients such as microcrystalline cellulose, sodium citrate, calcium carbonate, dicalcium phosphate and glycine may be employed along with various disintegrants such as starch (and preferably corn, potato or tapioca starch), alginic acid and certain complex silicate
• the active ingredient may be combined with various sweetening or flavouring agents, colouring matter or dyes, and, if so desired, emulsifying and/or suspending agents, together with diluents such as water, ethanol, propylene glycol, glycerin and various combinations thereof.
• solutions of compounds of the invention in either sesame or peanut oil or in aqueous propylene glycol may be employed.
• the aqueous solutions may be buffered (preferably pH greater than 8) if necessary and the liquid diluent first rendered isotonic.
• These aqueous solutions are suitable for intravenous injection purposes.
• the oily solutions are suitable for intraarticular, intramuscular and subcutaneous injection purposes. The preparation of all these solutions under sterile conditions is readily accomplished by standard pharmaceutical techniques well known to those skilled in the art.
• suitable preparations include solutions, preferably oily or aqueous solutions as well as suspensions, emulsions, or implants, including suppositories.
• Compounds of the invention may be formulated in sterile form in multiple or single dose formats.
• the compounds of the invention may be dispersed in a fluid carrier such as sterile saline or 5% saline dextrose solutions commonly used with injectables.
• the compounds of the invention may be administered topically for example when treating inflammatory conditions of the skin.
• methods of topical administration include transdermal, buccal or sublingual application.
• therapeutic compounds can be suitably admixed in a pharmacologically inert topical carrier such as a gel, an ointment, a lotion or a cream.
• topical carriers include water, glycerol, alcohol, propylene glycol, fatty alcohols, triglycerides, fatty acid esters, or mineral oils.
• topical carriers are liquid petrolatum, isopropylpalmitate, polyethylene glycol, ethanol 95%, polyoxyethylene monolauriate 5% in water, sodium lauryl sulphate 5% in water, and the like.
• materials such as anti-oxidants, humectants, viscosity stabilisers and the like also may be added if desired.
• enteral application particularly suitable are tablets, dragees or capsules having talc and/or carbohydrate carrier binder or the like, the carrier preferably being lactose and/or corn starch and/or potato starch.
• a syrup, elixir or the like can be used wherein a sweetened vehicle is employed.
• Sustained release compositions can be formulated including those wherein the active component is protected with differentially degradable coatings, e.g., by microencapsulation, multiple coatings, etc.
• the therapeutic methods of the invention also will have significant veterinary applications, e.g. for treatment of livestock such as cattle, sheep, goats, cows, swine and the like; poultry such as chickens, ducks, geese, turkeys and the like; horses; and pets such as dogs and cats.
• livestock such as cattle, sheep, goats, cows, swine and the like
• poultry such as chickens, ducks, geese, turkeys and the like
• horses and pets such as dogs and cats.
• the actual amount of the compound of the invention used in a given therapy will vary according to the specific compound being utilised, the particular compositions formulated, the mode of application, the particular site of administration, etc.
• Optimal administration rates for a given protocol of administration can be readily ascertained by those skilled in the art without undue
• compounds of the invention for treatment can be administered to a subject in dosages used in prior tetracycline therapies. See, for example, the Physicians' Desk Reference.
• a suitable effective dose of one or more compounds of the invention will be in the range of from 0.01 to 100 milligrams per kilogram of body weight of recipient per day, preferably in the range of from 0.1 to 50 milligrams per kilogram body weight of recipient per day, more preferably in the range of 1 to 20 milligrams per kilogram body weight of recipient per day.
• the desired dose is suitably administered once daily, or several sub-doses, e.g. 2 to 5 sub-doses, are administered at appropriate intervals through the day, or other appropriate schedule.
• the compounds and pharmaceutical compositions of the invention may be administered alone or in combination with other known compounds and compositions for treating tetracycline compound responsive states in a mammal e.g. a human.
• the term in combination with a known compound or composition is intended to include simultaneous, concomitant and sequential administration.
• the present invention provides a combination comprising a compound of formula (I) or a pharmaceutically acceptable derivative or solvate thereof, and a further active ingredient suitable for treating tetracycline compound responsive states in a mammal e.g. a human.
• a process for preparing a compound of Formula (I) wherein A is a pyrrole ring optionally substituted by one or more group R or a pharmaceutically acceptable derivative or solvate thereof comprises reacting a compound of fomula (II) with a compound of formula (III) wherein Ra and Rb are hydrogen or C ⁇ - alkyl under dehydrating conditions for example in the presence of sulphuric acid in methanol.
• a process for preparing a compound of Formula (I) wherein A is a pyrrole ring optionally substituted by one or more group CHNORa or a pharmaceutically acceptable derivative or solvate thereof comprises reacting a compound of fomula (IV) with NH 2 ORa in water.
• a process for preparing a compound of Formula (I) wherein A is a pyrrole ring optionally substituted by one or more group CH 2 NRaRb or a pharmaceutically acceptable derivative or solvate thereof comprises reacting a compound of fomula (IV) with NHRaRb under dehydrating conditions for example in the presence of acetic acid, methanol and water and then subjecting the product to a reducing agent such as sodium cyanoborohydride.
• a process for preparing a compound of Formula (I) wherein A is a tetrazole ring or a pharmaceutically acceptable derivative or solvate thereof comprises reacting a compound of fomula (II) with isobutyl nitrite in methanolic hydrochloric acid followed by treatment with a mixture containing sodium azide and triethyl orthoformate in acetic acid.
• a process for preparing a compound of Formula (I) wherein A is a 1,2,3-triazole ring optionally substituted by one or more group CO Ra or a pharmaceutically acceptable derivative or solvate thereof comprises reacting a compound of fomula (II) with isobutyl nitrite in methanolic hydrochloric acid followed by treatment with sodium azide to afford the corresponding 7-azido intermediate, and then subjecting the 7-azido intermediate to a reaction with alkylpropiolate in dioxane under reflux conditions.
• MS e.s.+: m/z 523.2 (M + +H)
• MS e.s.+
• Growth-inhibitory activity was determined on liquid medium by the antibiotic dilution technique using 96-well microtiter system plates containing two-fold dilutions of antibiotic-agent in 0.2 ml. of Mueller- ⁇ inton broth. Plates were inoculated with each test organism to yield a final inoculum of 5 x 10 5 CFU/ml and were incubated aerobically at 37° C for 18 h. The MIC was defined as the lowest concentration of antibacterial agent that inhibited development of visible growth in the microdilution wells.

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  • 2002-03-13 AU AU2002250331A patent/AU2002250331A1/en not_active Abandoned
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