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A:HUMAN NECESSITIES  
 A61: HEALTH; AMUSEMENT; MEDICAL OR VETERINARY SCIENCE; HYGIENE  
  A61K: PREPARATIONS FOR MEDICAL, DENTAL, OR TOILET PURPOSES (devices or methods specially adapted for bringing pharmaceutical products into particular physical or administering forms A61J3/00; chemical aspects of, or use of materials for deodorisation of air, for disinfection or sterilisation, or for bandages, dressings, absorbent pads or surgical articles A61L{; compounds per seC01, C07, C08, C12N; }; soap compositions C11D{; microorganisms per seC12N})  
   A61K31/00: Medicinal preparations containing organic active ingredients  
   A61K31/01: Hydrocarbons  
   A61K31/015: . . carbocyclic  
   A61K31/02: Halogenated hydrocarbons  
   A61K31/025: . . carbocyclic  
   A61K31/03: . . . aromatic  
   A61K31/035: . . having aliphatic unsaturation  
   A61K31/04: Nitro compounds  
   A61K31/045: Hydroxy compounds, e.g. alcohols; Salts thereof, e.g. alcoholates  
   A61K31/047: . . having two or more hydroxy groups, e.g. sorbitol  
   A61K31/05: . . Phenols  
   A61K31/055: . . . the aromatic ring being substituted by halogen  
   A61K31/06: . . . the aromatic ring being substituted by nitro groups  
   A61K31/065: . . Diphenyl-substituted acyclic alcohols  
   A61K31/07: . . Retinol compounds, e.g. vitamin A (retinoic acids A61K31/203)  
   A61K31/075: Ethers or acetals  
   A61K31/08: . . acyclic, e.g. paraformaldehyde  
   A61K31/085: . . having an ether linkage to aromatic ring nuclear carbon  
   A61K31/09: . . . having two or more such linkages  
   A61K31/095: Sulfur, selenium, or tellurium compounds, e.g. thiols  
   A61K31/10: . . Sulfides; Sulfoxides; Sulfones  
   A61K31/105: . . Persulfides (thiuram disulfides A61K31/145; thiosulfonic acids A61K31/185)  
   A61K31/11: Aldehydes  
   A61K31/115: . . Formaldehyde  
   A61K31/12: Ketones  
   A61K31/121: . . acyclic  
   A61K31/122: . . having the oxygen directly attached to a ring, e.g. quinones, vitamin K1, anthralin  
   A61K31/125: . . . Camphor; Nuclear substituted derivatives thereof  
   A61K31/13: Amines {A61K31/04 takes precedence}  
   A61K31/131: . . acyclic  
   A61K31/132: . . having two or more amino groups, e.g. spermidine, putrescine  
   A61K31/133: . . having hydroxy groups, e.g. sphingosine  
   A61K31/135: . . having aromatic rings {, e.g. ketamine, nortriptyline (methadone A61K31/137)}  
   A61K31/136: . . . having the amino group directly attached to the aromatic ring, e.g. benzeneamine  
   A61K31/137: . . . Arylalkylamines, e.g. amphetamine, epinephrine, salbutamol, ephedrine {or methadone}  
   A61K31/138: . . . Aryloxyalkylamines, e.g. propranolol, tamoxifen, phenoxybenzamine (atenolol A61K31/165; pindolol A61K31/404; timolol A61K31/5377)  
   A61K31/14: . . Quaternary ammonium compounds, e.g. edrophonium, choline (betaines A61K31/205)  
   A61K31/145: . . having sulfur, e.g. thiurams (>NC(S)SC(S)NNC(S)SSC(S)N<), Sulfinylamines (N=SO), Sulfonylamines (N=SO2) (isothiourea A61K31/155)  
   A61K31/15: . . Oximes (>C=NO); Hydrazines (>NNNN=) {; Imines (CN=C)}  
   A61K31/155: . . Amidines (), e.g. guanidine (H2NC(=NH)NH2), isourea (N=C(OH)NH2), isothiourea (N=C(SH)NH2)  
   A61K31/16: Amides, e.g. hydroxamic acids  
   A61K31/164: . . of a carboxylic acid with an aminoalcohol, e.g. ceramides  
   A61K31/165: . . having aromatic rings, e.g. colchicine, atenolol, progabide  
   A61K31/166: . . . having the carbon of a carboxamide group directly attached to the aromatic ring, e.g. procainamide, procarbazine, metoclopramide, labetalol  
   A61K31/167: . . . having the nitrogen of a carboxamide group directly attached to the aromatic ring, e.g. lidocaine, paracetamol  
   A61K31/17: . . having the group >NC(O)NNC(S)N<, e.g. urea, thiourea, carmustine (isoureas, isothioureas A61K31/155; sulfonylureas A61K31/64)  
   A61K31/175: . . . having the group , >NC(O)N=N or , e.g. carbonohydrazides, carbazones, semicarbazides, semicarbazones; Thioanalogues thereof  
   A61K31/18: . . Sulfonamides (compounds containing a para-N-benzene-sulfonyl-N- group A61K31/63)  
   A61K31/185: Acids; Anhydrides, halides or salts thereof, e.g. sulfur acids, imidic, hydrazonic, hydroximic acids (hydroxamic acids A61K31/16; peroxy acids A61K31/327)  
   A61K31/19: . . Carboxylic acids, e.g. valproic acid (salicylic acid A61K31/60)  
   A61K31/191: . . . having two or more hydroxy groups, e.g. gluconic acid  
   A61K31/192: . . . having aromatic groups, e.g. sulindac, 2-arylpropionic acids, ethacrynic acid  
   A61K31/194: . . . having two or more carboxyl groups, e.g. succinic, maleic or phthalic acid  
   A61K31/195: . . . having an amino group  
   A61K31/196: . . . . the amino group being directly attached to a ring, e.g. anthranilic acid, mefenamic acid, diclofenac, chlorambucil  
   A61K31/197: . . . . the amino and the carboxyl groups being attached to the same acyclic carbon chain, e.g. gamma-aminobutyric acid [GABA], beta-alanine, epsilon-aminocaproic acid, pantothenic acid (carnitine A61K31/205)  
   A61K31/198: . . . . . Alpha-aminoacids, e.g. alanine, edetic acids [EDTA], (betaine A61K31/205; proline A61K31/401; tryptophan A61K31/405; histidine A61K31/4172; peptides not degraded to individual aminoacids A61K38/00)  
   A61K31/20: . . . having a carboxyl group bound to a chain of seven or more carbon atoms, e.g. stearic, palmitic, arachidic acids  
   A61K31/201: . . . . having one or two double bonds, e.g. oleic, linoleic acids  
   A61K31/202: . . . . having three or more double bonds, e.g. linolenic (eicosanoids, e.g. leukotrienes A61K31/557)  
   A61K31/203: . . . . Retinoic acids {Salts thereof}  
   A61K31/205: . . Amine addition salts of organic acids; Inner quaternary ammonium salts, e.g. betaine, carnitine  
   A61K31/21: Esters, e.g. nitroglycerine, selenocyanates  
   A61K31/215: . . of carboxylic acids  
   A61K31/216: . . . of acids having aromatic rings, e.g. benactizyne, clofibrate  
   A61K31/22: . . . of acyclic acids, e.g. pravastatin  
   A61K31/221: . . . . with compounds having an amino group, e.g. acetylcholine, acetylcarnitine  
   A61K31/222: . . . . with compounds having aromatic groups, e.g. dipivefrine, ibopamine  
   A61K31/223: . . . . of alpha-aminoacids  
   A61K31/225: . . . . Polycarboxylic acids  
   A61K31/23: . . . . of acids having a carboxyl group bound to a chain of seven or more carbon atoms  
   A61K31/231: . . . . . having one or two double bonds  
   A61K31/232: . . . . . having three or more double bonds, e.g. etretinate  
   A61K31/235: . . . having an aromatic ring attached to a carboxyl group  
   A61K31/24: . . . . having an amino or nitro group  
   A61K31/245: . . . . . Amino benzoic acid types, e.g. procaine, novocaine (salicylic acid esters A61K31/60)  
   A61K31/25: . . . with polyoxyalkylated alcohols, e.g. esters of polyethylene glycol  
   A61K31/255: . . of sulfoxy acids or sulfur analogues thereof  
   A61K31/26: . . Cyanate or isocyanate esters; Thiocyanate or isothiocyanate esters  
   A61K31/265: . . of carbonic, thiocarbonic, or thiocarboxylic acids, e.g. thioacetic acid, xanthogenic acid, trithiocarbonic acid  
   A61K31/27: . . of carbamic or thiocarbamic acids, meprobamate, carbachol, neostigmine  
   A61K31/275: Nitriles; Isonitriles  
   A61K31/277: . . having a ring, e.g. verapamil  
   A61K31/28: Compounds containing heavy metals  
   A61K31/282: . . Platinum compounds  
   A61K31/285: . . Arsenic compounds  
   A61K31/29: . . Antimony or bismuth compounds  
   A61K31/295: . . Iron group metal compounds  
   A61K31/30: . . Copper compounds  
   A61K31/305: . . Mercury compounds  
   A61K31/31: . . . containing nitrogen  
   A61K31/315: . . Zinc compounds  
   A61K31/32: . . Tin compounds  
   A61K31/325: Carbamic acids; Thiocarbamic acids; Anhydrides or salts thereof (thiurams A61K31/145)  
   A61K31/327: Peroxy compounds, e.g. hydroperoxides, peroxides, peroxyacids  
   A61K31/33: Heterocyclic compounds  
   A61K31/335: . . having oxygen as the only ring hetero atom, e.g. fungichromin  
   A61K31/336: . . . having three-membered rings, e.g. oxirane, fumagillin  
   A61K31/337: . . . having four-membered rings, e.g. taxol  
   A61K31/34: . . . having five-membered rings with one oxygen as the only ring hetero atom, e.g. isosorbide  
   A61K31/341: . . . . not condensed with another ring, e.g. ranitidine, furosemide, bufetolol, muscarine  
   A61K31/343: . . . . condensed with a carbocyclic ring, e.g. coumaran, bufuralol, befunolol, clobenfurol, amiodarone  
   A61K31/345: . . . . Nitrofurans (nitrofurantoin A61K31/4178)  
   A61K31/35: . . . having six-membered rings with one oxygen as the only ring hetero atom  
   A61K31/351: . . . . not condensed with another ring  
   A61K31/352: . . . . condensed with carbocyclic rings, e.g. cannabinols, methantheline  
   A61K31/353: . . . . . 3,4-Dihydrobenzopyrans, e.g. chroman, catechin  
   A61K31/355: . . . . . . Tocopherols, e.g. vitamin E  
   A61K31/357: . . . having two or more oxygen atoms in the same ring, e.g. crown ethers, guanadrel  
   A61K31/36: . . . . Compounds containing methylenedioxyphenyl groups, e.g. sesamin  
   A61K31/365: . . . Lactones  
   A61K31/366: . . . . having six-membered rings, e.g. delta-lactones  
   A61K31/37: . . . . . Coumarins, e.g. psoralen  
   A61K31/375: . . . . Ascorbic acid, i.e. vitamin C; Salts thereof  
   A61K31/38: . . having sulfur as a ring hetero atom  
   A61K31/381: . . . having five-membered rings  
   A61K31/382: . . . having six-membered rings, e.g. thioxanthenes (thiotixene A61K31/496)  
   A61K31/385: . . . having two or more sulfur atoms in the same ring  
   A61K31/39: . . . having oxygen in the same ring  
   A61K31/395: . . having nitrogen as a ring hetero atom, e.g. guanethidine, rifamycins (rifampin A61K31/496)  
   A61K31/396: . . . having three-membered rings, e.g. aziridine  
   A61K31/397: . . . having four-membered rings, e.g. azetidine  
   A61K31/40: . . . having five-membered rings with one nitrogen as the only ring hetero atom, e.g. sulpiride, succinimide, tolmetin, buflomedil  
   A61K31/401: . . . . Proline; Derivatives thereof, e.g. captopril  
   A61K31/4015: . . . . having oxo groups directly attached to the heterocyclic ring, e.g. piracetam, ethosuximide  
   A61K31/402: . . . . 1-aryl substituted, e.g. piretanide  
   A61K31/4025: . . . . not condensed and containing further heterocyclic rings, e.g. cromakalim  
   A61K31/403: . . . . condensed with carbocyclic rings, e.g. carbazole  
   A61K31/4035: . . . . . Isoindoles, e.g. phthalimide  
   A61K31/404: . . . . . Indoles, e.g. pindolol  
   A61K31/4045: . . . . . . Indole-alkylamines; Amides thereof, e.g. serotonin, melatonin  
   A61K31/405: . . . . . . Indole-alkanecarboxylic acids; Derivatives thereof, e.g. tryptophan, indomethacin  
   A61K31/407: . . . . condensed with other heterocyclic ring systems, e.g. ketorolac, physostigmine  
   A61K31/409: . . . . having four such rings, e.g. porphine derivatives, bilirubin, biliverdine (hemin, hematin A61K31/555)  
   A61K31/41: . . . having five-membered rings with two or more ring hetero atoms, at least one of which being nitrogen, e.g. tetrazole  
   A61K31/415: . . . . 1,2-Diazoles  
   A61K31/4152: . . . . . having oxo groups directly attached to the heterocyclic ring, e.g. antipyrine, phenylbutazone, sulfinpyrazone  
   A61K31/4155: . . . . . non condensed and containing further heterocyclic rings  
   A61K31/416: . . . . . condensed with carbocyclic ring systems, e.g. indazole  
   A61K31/4162: . . . . . condensed with heterocyclic ring systems  
   A61K31/4164: . . . . 1,3-Diazoles  
   A61K31/4166: . . . . . having oxo groups directly attached to the heterocyclic ring, e.g. phenytoin  
   A61K31/4168: . . . . . having a nitrogen attached in position 2, e.g. clonidine  
   A61K31/417: . . . . . Imidazole-alkylamines, e.g. histamine, phentolamine  
   A61K31/4172: . . . . . Imidazole-alkanecarboxylic acids, e.g. histidine  
   A61K31/4174: . . . . . Arylalkylimidazoles, e.g. oxymetazolin, naphazoline, miconazole  
   A61K31/4178: . . . . . not condensed 1,3-diazoles and containing further heterocyclic rings, e.g. pilocarpine, nitrofurantoin  
   A61K31/4184: . . . . . condensed with carbocyclic rings, e.g. benzimidazoles  
   A61K31/4188: . . . . . condensed with other heterocyclic ring systems, e.g. biotin, sorbinil  
   A61K31/4192: . . . . 1,2,3-Triazoles  
   A61K31/4196: . . . . 1,2,4-Triazoles  
   A61K31/42: . . . . Oxazoles  
   A61K31/421: . . . . . 1,3-Oxazoles, e.g. pemoline, trimethadione  
   A61K31/422: . . . . . not condensed and containing further heterocyclic rings  
   A61K31/423: . . . . . condensed with carbocyclic rings  
   A61K31/424: . . . . . condensed with heterocyclic ring systems, e.g. clavulanic acid  
   A61K31/4245: . . . . Oxadiazoles  
   A61K31/425: . . . . Thiazoles  
   A61K31/426: . . . . . 1,3-Thiazoles  
   A61K31/427: . . . . . not condensed and containing further heterocyclic rings  
   A61K31/428: . . . . . condensed with carbocyclic rings  
   A61K31/429: . . . . . condensed with heterocyclic ring systems  
   A61K31/43: . . . . . . Compounds containing 4-thia-1-azabicyclo [3.2.0] heptane ring systems, i.e. compounds containing a ring system of the formula , e.g. penicillins, penems  
   A61K31/431: . . . . . . . containing further heterocyclic rings, e.g. ticarcillin, azlocillin, oxacillin  
   A61K31/433: . . . . Thidiazoles  
   A61K31/435: . . . having six-membered rings with one nitrogen as the only ring hetero atom  
   A61K31/4353: . . . . ortho- or peri-condensed with heterocyclic ring systems  
   A61K31/4355: . . . . . the heterocyclic ring system containing a five-membered ring having oxygen as a ring hetero atom  
   A61K31/436: . . . . . the heterocyclic ring system containing a six-membered ring having oxygen as a ring hetero atom, e.g. rapamycin  
   A61K31/4365: . . . . . the heterocyclic ring system having sulfur as a ring hetero atom, e.g. ticlopidine  
   A61K31/437: . . . . . the heterocyclic ring system containing a five-membered ring having nitrogen as a ring hetero atom, e.g. indolizine, beta-carboline  
   A61K31/4375: . . . . . the heterocyclic ring system containing a six-membered ring having nitrogen as a ring heteroatom, e.g. quinolizines, naphthyridines, berberine, vincamine  
   A61K31/438: . . . . the ring being spiro-condensed with carbocyclic ring systems  
   A61K31/439: . . . . the ring forming part of a bridged ring system, e.g. quinuclidine (8-azabicyclo [3.2.1] octanes A61K31/46)  
   A61K31/44: . . . . Non condensed pyridines; Hydrogenated derivatives thereof  
   A61K31/4402: . . . . . only substituted in position 2, e.g. pheniramine, bisacodyl  
   A61K31/4406: . . . . . only substituted in position 3, e.g. zimeldine (nicotinic acid A61K31/455)  
   A61K31/4409: . . . . . only substituted in position 4, e.g. isoniazid, iproniazid  
   A61K31/4412: . . . . . having oxo groups directly attached to the heterocyclic ring  
   A61K31/4415: . . . . . Pyridoxine, i.e. Vitamin B6(pyridoxal phosphate A61K31/675)  
   A61K31/4418: . . . . . having a carbocyclic group directly attached to the heterocyclic ring, e.g. cyproheptadine  
   A61K31/4422: . . . . . 1,4-Dihydropyridines, e.g. nifedipine, nicardipine  
   A61K31/4425: . . . . . Pyridinium derivatives, e.g. pralidoxime, pyridostigmine  
   A61K31/4427: . . . . . containing further heterocyclic ring systems  
   A61K31/443: . . . . . . containing a five-membered ring with oxygen as a ring hetero atom  
   A61K31/4433: . . . . . . containing a six-membered ring with oxygen as a ring hetero atom  
   A61K31/4436: . . . . . . containing a heterocyclic ring having sulfur as a ring hetero atom  
   A61K31/4439: . . . . . . containing a five-membered ring with nitrogen as a ring hetero atom, e.g. omeprazole (nicotine A61K31/465)  
   A61K31/444: . . . . . . containing a six-membered ring with nitrogen as a ring heteroatom, e.g. amrinone  
   A61K31/445: . . . . . Non condensed piperidines, e.g. piperocaine  
   A61K31/4453: . . . . . . only substituted in position 1, e.g. propipocaine, diperodon  
   A61K31/4458: . . . . . . only substituted in position 2, e.g. methylphenidate  
   A61K31/4462: . . . . . . only substituted in position 3  
   A61K31/4465: . . . . . . only substituted in position 4  
   A61K31/4468: . . . . . . having a nitrogen directly attached in position 4, e.g. clebopride, fentanyl  
   A61K31/45: . . . . . . having oxo groups directly attached to the heterocyclic ring, e.g. cycloheximide  
   A61K31/451: . . . . . . having a carbocyclic group directly attached to the heterocyclic ring, e.g. glutethimide, meperidine, loperamide, phencyclidine, piminodine  
   A61K31/4515: . . . . . . having a butyrophenone group in position 1, e.g. haloperidol (pipamperone A61K31/4545)  
   A61K31/452: . . . . . . Piperidinium derivatives (pancuronium A61K31/58)  
   A61K31/4523: . . . . . . containing further heterocyclic ring systems  
   A61K31/4525: . . . . . . . containing a five-membered ring with oxygen as a ring hetero atom  
   A61K31/453: . . . . . . . containing a six-membered ring with oxygen as a ring hetero atom  
   A61K31/4535: . . . . . . . containing a heterocyclic ring having sulfur as a ring hetero atom, e.g. pizotifen  
   A61K31/454: . . . . . . . containing a five-membered ring with nitrogen as a ring hetero atom, e.g. pimozide, domperidone  
   A61K31/4545: . . . . . . . containing a six-membered ring with nitrogen as a ring hetero atom, e.g. pipamperone, anabasine  
   A61K31/455: . . . . . Nicotinic acids, e.g. niacin; Derivatives thereof, e.g. esters, amides  
   A61K31/46: . . . . 8-Azabicyclo [3.2.1] octane; Derivatives thereof, e.g. atropine, cocaine  
   A61K31/465: . . . . Nicotine; Derivatives thereof  
   A61K31/47: . . . . Quinolines; Isoquinolines  
   A61K31/4704: . . . . . 2-Quinolinones, e.g. carbostyril  
   A61K31/4706: . . . . . 4-Aminoquinolines; 8-Aminoquinolines, e.g. chloroquine, primaquine  
   A61K31/4709: . . . . . Non-condensed quinolines and containing further heterocyclic rings  
   A61K31/472: . . . . . Non-condensed isoquinolines, e.g. papaverine  
   A61K31/4725: . . . . . . containing further heterocyclic rings  
   A61K31/473: . . . . . ortho- or peri-condensed with carbocyclic ring systems, e.g. acridines, phenanthridines  
   A61K31/4738: . . . . . ortho- or peri-condensed with heterocyclic ring systems  
   A61K31/4741: . . . . . . condensed with ring systems having oxygen as a ring hetero atom, e.g. tubocuraran derivatives, noscapine, bicuculline  
   A61K31/4743: . . . . . . condensed with ring systems having sulfur as a ring hetero atom  
   A61K31/4745: . . . . . . condensed with ring systems having nitrogen as a ring hetero atom, e.g. phenantrolines (yohimbine derivatives, vinblastine A61K31/475; ergoline derivatives A61K31/48)  
   A61K31/4747: . . . . . spiro-condensed  
   A61K31/4748: . . . . . forming part of bridged ring systems (strychnine A61K31/475; morphinan derivatives A61K31/485)  
   A61K31/475: . . . . . having an indole ring, e.g. yohimbine, reserpine, strychnine, vinblastine (vincamine A61K31/4375)  
   A61K31/48: . . . . . Ergoline derivatives, e.g. lysergic acid, ergotamine  
   A61K31/485: . . . . . Morphinan derivatives, e.g. morphine, codeine  
   A61K31/49: . . . . . Cinchonan derivatives, e.g. quinine  
   A61K31/495: . . . having six-membered rings with two {or more}; nitrogen atoms as the only ring heteroatoms, e.g. piperazine {or tetrazines}(A61K31/48 takes precedence {; with three nitrogen atoms A61K31/53})  
   A61K31/496: . . . . Non-condensed piperazines containing further heterocyclic rings, e.g. rifampin, thiothixene  
   A61K31/4965: . . . . Non-condensed pyrazines  
   A61K31/497: . . . . . containing further heterocyclic rings  
   A61K31/498: . . . . Pyrazines or piperazines ortho- and peri-condensed with carbocyclic ring systems, e.g. quinoxaline, phenazine  
   A61K31/4985: . . . . Pyrazines or piperazines ortho- or peri-condensed with heterocyclic ring systems  
   A61K31/499: . . . . Spiro-condensed pyrazines or piperazines  
   A61K31/4995: . . . . Pyrazines or piperazines forming part of bridged ring systems  
   A61K31/50: . . . . Pyridazines; Hydrogenated pyridazines  
   A61K31/501: . . . . . not condensed and containing further heterocyclic rings  
   A61K31/502: . . . . . ortho- or peri-condensed with carbocyclic ring systems, e.g. cinnoline, phthalazine  
   A61K31/5025: . . . . . ortho- or peri-condensed with heterocyclic ring systems  
   A61K31/503: . . . . . spiro-condensed  
   A61K31/504: . . . . . forming part of bridged ring systems  
   A61K31/505: . . . . Pyrimidines; Hydrogenated pyrimidines, e.g. trimethoprim  
   A61K31/506: . . . . . not condensed and containing further heterocyclic rings  
   A61K31/51: . . . . . . Thiamines, e.g. vitamin B1  
   A61K31/513: . . . . . having oxo groups directly attached to the heterocyclic ring, e.g. cytosine  
   A61K31/515: . . . . . . Barbituric acids; Derivatives thereof, e.g. sodium pentobarbital  
   A61K31/517: . . . . . ortho- or peri-condensed with carbocyclic ring systems, e.g. quinazoline, perimidine  
   A61K31/519: . . . . . ortho- or peri-condensed with heterocyclic rings  
   A61K31/52: . . . . . . Purines, e.g. adenine  
   A61K31/522: . . . . . . . having oxo groups directly attached to the heterocyclic ring, e.g. hypoxanthine, guanine, acyclovir  
   A61K31/525: . . . . . . Isoalloxazines, e.g. riboflavins, vitamin B2  
   A61K31/527: . . . . . spiro-condensed  
   A61K31/529: . . . . . forming part of bridged ring systems  
   A61K31/53: . . . having six-membered rings with three nitrogens as the only ring hetero atoms, e.g. chlorazanil, melamine (melarsoprol A61K31/555{; with four nitrogen atoms A61K31/495})  
   A61K31/535: . . . having six-membered rings with at least one nitrogen and one oxygen as the ring hetero atoms, e.g. 1,2-oxazines  
   A61K31/5355: . . . . Non-condensed oxazines and containing further heterocyclic rings  
   A61K31/536: . . . . ortho- or peri-condensed with carbocyclic ring systems  
   A61K31/5365: . . . . ortho- or peri-condensed with heterocyclic ring systems  
   A61K31/537: . . . . spiro-condensed or forming part of bridged ring systems  
   A61K31/5375: . . . . 1,4-Oxazines, e.g. morpholine  
   A61K31/5377: . . . . . not condensed and containing further heterocyclic rings, e.g. timolol  
   A61K31/538: . . . . . ortho- or peri-condensed with carbocyclic ring systems  
   A61K31/5383: . . . . . ortho- or peri-condensed with heterocyclic ring systems  
   A61K31/5386: . . . . . spiro-condensed or forming part of bridged ring systems  
   A61K31/539: . . . . having two or more oxygen atoms in the same ring, e.g. dioxazines  
   A61K31/5395: . . . . having two or more nitrogen atoms in the same ring, e.g. oxadiazines  
   A61K31/54: . . . having six-membered rings with at least one nitrogen and one sulfur as the ring hetero atoms, e.g. sulthiame  
   A61K31/541: . . . . Non-condensed thiazines containing further heterocyclic rings  
   A61K31/5415: . . . . ortho- or peri-condensed with carbocyclic ring systems, e.g. phenothiazine, chlorpromazine, piroxicam  
   A61K31/542: . . . . ortho- or peri-condensed with heterocyclic ring systems  
   A61K31/545: . . . . . Compounds containing 5-thia-1-azabicyclo [4.2.0] octane ring systems, i.e. compounds containing a ring system of the formula: , e.g. cephalosporins, {cefaclor, or cephalexine}  
   A61K31/546: . . . . . . containing further heterocyclic rings, e.g. cephalothin  
   A61K31/547: . . . . spiro-condensed or forming part of bridged ring systems  
   A61K31/548: . . . . having two or more sulfur atoms in the same ring  
   A61K31/549: . . . . having two or more nitrogen atoms in the same ring, e.g. hydrochlorothiazide  
   A61K31/55: . . . having seven-membered rings, e.g. azelastine, pentylenetetrazole  
   A61K31/551: . . . . having two nitrogen atoms, e.g. dilazep  
   A61K31/5513: . . . . . 1,4-Benzodiazepines, e.g. diazepam {or clozapine}  
   A61K31/5517: . . . . . . condensed with five-membered rings having nitrogen as a ring hetero atom, e.g. imidazobenzodiazepines, triazolam  
   A61K31/553: . . . . having at least one nitrogen and one oxygen as ring hetero atoms, e.g. loxapine, staurosporine  
   A61K31/554: . . . . having at least one nitrogen and one sulfur as ring hetero atoms, e.g. chlothiapine, diltiazem  
   A61K31/5545: . . . having eight-membered rings not containing additional condensed or non-condensed nitrogen-containing 3-7 membered rings  
   A61K31/555: . . containing heavy metals, e.g. hemin, hematin, melarsoprol  
   A61K31/557: Eicosanoids, e.g. leukotrienes {or prostaglandins}  
   A61K31/5575: . . having a cyclopentane, e.g. prostaglandin E2, prostaglandin F2-alpha  
   A61K31/5578: . . having a pentalene ring system, e.g. carbacyclin, iloprost  
   A61K31/558: . . having heterocyclic rings containing oxygen as the only ring hetero atom, e.g. thromboxanes  
   A61K31/5585: . . . having five-membered rings containing oxygen as the only ring hetero atom, e.g. prostacyclin  
   A61K31/559: . . having heterocyclic rings containing hetero atoms other than oxygen  
   A61K31/56: Compounds containing cyclopenta[a]hydrophenanthrene ring systems; Derivatives, e.g. steroids  
   A61K31/565: . . not substituted in position 17 beta by a carbon atom, e.g. estrane, estradiol  
   A61K31/566: . . . having an oxo group in position 17, e.g. estrone  
   A61K31/567: . . . substituted in position 17 alpha, e.g. mestranol, norethandrolone  
   A61K31/568: . . . substituted in positions 10 and 13 by a chain having at least one carbon atom, e.g. androstanes, e.g. testosterone  
   A61K31/5685: . . . . having an oxo group in position 17, e.g. androsterone  
   A61K31/569: . . . . substituted in position 17 alpha, e.g. ethisterone  
   A61K31/57: . . substituted in position 17 beta by a chain of two carbon atoms, e.g. pregnane, progesterone  
   A61K31/573: . . . substituted in position 21, e.g. cortisone, dexamethasone, prednisone {or aldosterone}  
   A61K31/575: . . substituted in position 17 beta by a chain of three or more carbon atoms, e.g. cholane, cholestane, ergosterol, sitosterol  
   A61K31/58: . . containing heterocyclic rings, e.g. danazol, stanozolol, pancuronium or digitogenin {digitoxin A61K31/7048}  
   A61K31/585: . . . containing lactone rings, e.g. oxandrolone, bufalin  
   A61K31/59: Compounds containing 9, 10- seco- cyclopenta[a]hydrophenanthrene ring systems  
   A61K31/592: . . 9,10-Secoergostane derivatives, e.g. ergocalciferol, i.e. vitamin D2  
   A61K31/593: . . 9,10-Secocholestane derivatives, e.g. cholecalciferol, i.e. vitamin D3  
   A61K31/60: Salicylic acid; Derivatives thereof  
   A61K31/603: . . having further aromatic rings, e.g. diflunisal  
   A61K31/606: . . having amino groups  
   A61K31/609: . . Amides, e.g. salicylamide {labetalol, metoclopramide A61K31/166}  
   A61K31/612: . . having the hydroxy group in position 2 esterified, e.g. salicylsulfuric acid (fosfosal A61K31/661)  
   A61K31/616: . . . by carboxylic acids, e.g. acetylsalicylic acid  
   A61K31/618: . . having the carboxyl group in position 1 esterified, e.g. salsalate  
   A61K31/621: . . . having the hydroxy group in position 2 esterified, e.g. benorylate  
   A61K31/625: . . having heterocyclic substituents, e.g. 4-salicycloylmorpholine, (sulfasalazine A61K31/635)  
   A61K31/63: Compounds containing para-N-benzenesulfonyl-N-groups, e.g. sulfanilamide, p-nitrobenzenesulfonyl hydrazide  
   A61K31/635: . . having a heterocyclic ring, e.g. sulfasalazine  
   A61K31/64: Sulfonylureas, e.g. glibenclamide, tolbutamide, chlorpropamide  
   A61K31/65: Tetracyclines  
   A61K31/655: Azo (N=N), diazo (=N2), azoxy (>NON< or N(=O)N<), azido (N3) or diazoamino (N=NN<) compounds  
   A61K31/66: Phosphorus compounds  
   A61K31/661: . . Phosphorus acids or esters thereof not having PC bonds, e.g. fosfosal, dichlorvos, malathion {or mevinphos}  
   A61K31/6615: . . . Compounds having two or more esterified phosphorus acid groups, e.g. inositol triphosphate, phytic acid  
   A61K31/662: . . Phosphorus acids or esters thereof having PC bonds, e.g. foscarnet, trichlorfon  
   A61K31/663: . . . Compounds having two or more phosphorus acid groups or esters thereof, e.g. clodronic acid, pamidronic acid  
   A61K31/664: . . Amides of phosphorus acids  
   A61K31/665: . . having oxygen as a ring hetero atom, e.g. fosfomycin  
   A61K31/67: . . having sulfur as a ring hetero atom  
   A61K31/675: . . having nitrogen as a ring hetero atom, e.g. pyridoxal phosphate  
   A61K31/683: . . Diesters of a phosphorus acid with two hydroxy compounds, e.g. phosphatidylinositols  
   A61K31/685: . . . one of the hydroxy compounds having nitrogen atoms, e.g. phosphatidylserine, lecithin  
   A61K31/688: . . . both hydroxy compounds having nitrogen atoms, e.g. sphingomyelins  
   A61K31/69: Boron compounds  
   A61K31/695: Silicon compounds  
   A61K31/70: Carbohydrates; Sugars; Derivatives thereof (sorbitol A61K31/047)  
   A61K31/7004: . . Monosaccharides having only carbon, hydrogen and oxygen atoms  
   A61K31/7008: . . Compounds having an amino group directly attached to a carbon atom of the saccharide radical, e.g. D-galactosamine, ranimustine  
   A61K31/7012: . . Compounds having a free or esterified carboxyl group attached, directly or through a carbon chain, to a carbon atom of the saccharide radical, e.g. glucuronic acid, neuraminic acid (gluconic acid A61K31/191; ascorbic acid A61K31/375)  
   A61K31/7016: . . Disaccharides, e.g. lactose, lactulose (lactobionic acid A61K31/7032)  
   A61K31/702: . . Oligosaccharides, i.e. having three to five saccharide radicals attached to each other by glycosidic linkages  
   A61K31/7024: . . Esters of saccharides  
   A61K31/7028: . . Compounds having saccharide radicals attached to non-saccharide compounds by glycosidic linkages  
   A61K31/7032: . . . attached to a polyol, i.e. compounds having two or more free or esterified hydroxy groups, including the hydroxy group involved in the glycosidic linkage, e.g. monoglucosyldiacylglycerides, lactobionic acid, gangliosides  
   A61K31/7034: . . . attached to a carbocyclic compound, e.g. phloridzin  
   A61K31/7036: . . . . having at least one amino group directly attached to the carbocyclic ring, e.g. streptomycin, gentamycin, amikacin, validamycin, fortimicins  
   A61K31/704: . . . . attached to a condensed carbocyclic ring system, e.g. sennosides, thiocolchicosides, escin, daunorubicin {digitoxin A61K31/7048}  
   A61K31/7042: . . Compounds having saccharide radicals and heterocyclic rings  
   A61K31/7048: . . . having oxygen as a ring hetero atom, e.g. leucoglucosan, hesperidin, erythromycin, nystatin {digitoxin or digoxin}  
   A61K31/7052: . . . having nitrogen as a ring hetero atom, e.g. nucleosides, nucleotides  
   A61K31/7056: . . . . containing five-membered rings with nitrogen as a ring hetero atom  
   A61K31/706: . . . . containing six-membered rings with nitrogen as a ring hetero atom  
   A61K31/7064: . . . . . containing condensed or non-condensed pyrimidines  
   A61K31/7068: . . . . . . having oxo groups directly attached to the pyrimidine ring, e.g. cytidine, cytidylic acid  
   A61K31/7072: . . . . . . . having two oxo groups directly attached to the pyrimidine ring, e.g. uridine, uridylic acid, thymidine, zidovudine  
   A61K31/7076: . . . . . . containing purines, e.g. adenosine, adenylic acid  
   A61K31/708: . . . . . . . having oxo groups directly attached to the purine ring system, e.g. guanosine, guanylic acid  
   A61K31/7084: . . Compounds having two nucleosides or nucleotides, e.g. nicotinamide-adenine dinucleotide, flavine-adenine dinucleotide  
   A61K31/7088: . . Compounds having three or more nucleosides or nucleotides  
   A61K31/7105: . . . Natural ribonucleic acids, i.e. containing only riboses attached to adenine, guanine, cytosine or uracil and having 3'-5' phosphodiester links  
   A61K31/711: . . . Natural deoxyribonucleic acids, i.e. containing only 2'-deoxyriboses attached to adenine, guanine, cytosine or thymine and having 3'-5' phosphodiester links  
   A61K31/7115: . . . Nucleic acids or oligonucleotides having modified bases, i.e. other than adenine, guanine, cytosine, uracil or thymine  
   A61K31/712: . . . Nucleic acids or oligonucleotides having modified sugars, i.e. other than ribose or 2'-deoxyribose  
   A61K31/7125: . . . Nucleic acids or oligonucleotides having modified internucleoside linkage, i.e. other than 3'-5' phosphodiesters  
   A61K31/713: . . . Double-stranded nucleic acids or oligonucleotides  
   A61K31/7135: . . Compounds containing heavy metals  
   A61K31/714: . . . Cobalamins, e.g. cyanocobalamin, i.e. vitamin B12  
   A61K31/715: . . Polysaccharides, i.e. having more than five saccharide radicals attached to each other by glycosidic linkages; Derivatives thereof, e.g. ethers, esters  
   A61K31/716: . . . Glucans  
   A61K31/717: . . . . Celluloses  
   A61K31/718: . . . . Starch or degraded starch, e.g. amylose, amylopectin  
   A61K31/719: . . . . Pullulans  
   A61K31/721: . . . . Dextrans  
   A61K31/722: . . . . Chitin, chitosan  
   A61K31/723: . . . . Xanthans  
   A61K31/724: . . . . Cyclodextrins  
   A61K31/726: . . . Glycosaminoglycans, i.e. mucopolysaccharides (chondroitin sulfate, dermatan sulfate A61K31/737)  
   A61K31/727: . . . . Heparin; Heparan  
   A61K31/728: . . . . Hyaluronic acid  
   A61K31/729: . . . Agar; Agarose; Agaropectin  
   A61K31/731: . . . Carrageenans  
   A61K31/732: . . . Pectin  
   A61K31/733: . . . Fructosans, e.g. inulin  
   A61K31/734: . . . Alginic acid  
   A61K31/736: . . . Glucomannans or galactomannans, e.g. locust bean gum, guar gum  
   A61K31/737: . . . Sulfated polysaccharides, e.g. chondroitin sulfate, dermatan sulfate (A61K31/727 takes precedence)  
   A61K31/738: . . . Cross-linked polysaccharides  
   A61K31/739: . . . Lipopolysaccharides  
   A61K31/74: Synthetic polymeric materials  
   A61K31/745: . . Polymers of hydrocarbons  
   A61K31/75: . . . of ethene  
   A61K31/755: . . Polymers containing halogen  
   A61K31/76: . . . of vinyl chloride  
   A61K31/765: . . Polymers containing oxygen  
   A61K31/77: . . . of oxiranes  
   A61K31/775: . . . Phenolic resins  
   A61K31/78: . . . of acrylic acid or derivatives thereof  
   A61K31/785: . . Polymers containing nitrogen  
   A61K31/787: . . . containing heterocyclic rings having nitrogen as a ring hetero atom  
   A61K31/79: . . . . Polymers of vinyl pyrrolidone  
   A61K31/795: . . Polymers containing sulfur  
   A61K31/80: . . Polymers containing hetero atoms not provided for in groups A61K31/755-A61K31/795