l-Alanyl-l-glutamine

A dipeptide formed from L-alanyl and L-glutamine residues.


Phosphite

A trivalent inorganic anion obtained by removal of all three protons from phosphorous acid.


Shuangling Fuzheng anticancer preparation


A  dithiane  that is cyclohexane in which the -CH2- units at positions 1 and 2 have been replaced by sulfur atoms.


Tripotassium citrate monohydrate

A hydrate that is the monohydrate form of potassium citrate.


Trypanothione

An organic disulfide resulting from the formal oxidative coupling of the thiol groups of N(1),N(8)-bis(glutathionyl)-spermidine from the insect-parasitic trypanosomatid Crithidia fasciculata.


A member of the class of oxindoles that is 5-chlorooxindole in which the two hydrogens at position 3 are replaced by a (3,5-dimethylpyrrol-2-yl)methylidene group.


Cyclohexylamine

A primary aliphatic amine consisting of cyclohexane carrying an amino substituent.


triazene derivative

A nitrogen molecular entity resulting from the formal substitution of one or more of the hydrogens of triazene.


A dichlorobiphenyl that is 1,3-dichlorobenzene in which the hydrogen at position 2 is replaced by a phenyl group.


Asperphenamate

A carboxylic ester resulting from the formal condensation of the carboxy group of N-benzoyl-L-phenylalanine with the hydroxy group of N-benzoyl-L-phenylalaninol. A metabolite found in several Pencillium and Aspergillus species, as well as in plants as a product of endophytic fungi.


Olivetol

A member of the class of resorcinols that is resorcinol in which the hydrogen at position 5 is replaced by a pentyl group.


Corianin

A sesquiterpene lactone containing an epoxide group and two tertiary hydroxy groups that has been isolated from the fruits of Coriaria ruscifolia and Coriaria japonica.


Isoconazole

A member of the class of imidazoles that carries a 2-[(2,6-dichlorobenzyl)oxy]-2-(2,4-dichlorophenyl)ethyl group at position 1.


Benfluralin

A tertiany amino compound that is 2,6-dinitro-4-(trifluoromethyl)aniline in which the hydrogens attached to the aniline nitrogen have been replaced by one ethyl and one butyl group. It is used as a pre-emergence herbicide used for the control of grass and other weeds in a range of food and non-food crops.


Double green

An iminium salt composed of (4-{[4-(dimethylamino)phenyl][4-(trimethylazaniumyl)phenyl]methylidene}cyclohexa-2,5-dien-1-ylidene)(dimethyl)ammonium and chloride ions in a 1:2 ratio. A histological dye used to demonstrate nucleic acids by the Unna-Pappenheim stain, in conjunction with Pyronin Y.


Sodium Citrate

The trisodium salt of citric acid.


Sertaconazole

A racemate comprising equimolar amounts of (R)- and (S)-sertaconazole. A broad spectrum antifungal with added antipruritic and anti-inflammatory activity used (as its nitrate salt) for treatment of various skin infections.


A 3beta-sterol consisting of stigmastan-3beta-ol with double bonds at positions 5 and 24(28).


Cinoxacin

A member of the class of  cinnolines  that is 6,7-methylenedioxycinnolin-4(1H)-one bearing an ethyl group at position 1 and a carboxylic acid group at position 3. An analogue of oxolinic acid, it has similar antibacterial actions. It was formerly used for the treatment of urinary tract infections.


A member of the class of 3-nitrophenols that is phenol in which one of the hydrogens that is meta to the hydroxy group has been replaced by a nitro group.


Picrocrocin

A beta-D-glucoside of beta-cyclocitral; the precursor of safranal. It is the compound most responsible for the bitter taste of saffron.


Eletriptan

An N-alkylpyrrolidine, that is N-methylpyrrolidine in which the pro-R hydrogen at position 2 is replaced by a {5-[2-(phenylsulfonyl)ethyl]-1H-indol-3-yl}methyl group.


Azure A

An organic chloride salt having 3-amino-7-(dimethylamino)phenothiazin-5-ium as the counterion. It is used in making azure eosin stains for blood smear staining.


Atracurium

A diester compound consisting of pentane-1,5-diol with both hydroxyls bearing 3-[1-(3,4-dimethoxybenzyl)-6,7-dimethoxy-2-methyl-3,4-dihydroisoquinolinium-2(1H)-yl]propanoyl groups.


Crotaglin

An enamide resulting from the formal condensation of crotonic acid with N-ethyl-2-methylaniline. A colourless or pale yellow oily liquid, it is used in the treatment of pruritus (itching) by producing a counter-irritation: as it evaporates from the skin, it produces a cooling effect that diverts attention away from the itching. It has also been used as an acaricide in the treatment of scabies, though more effective drugs are usually preferred.


A non-proteinogenic alpha-amino acid that is alanine substituted at position 3 by a 2-hydroxy-1,4-benzoquinon-5-yl group.


A tetrachlorophenol in which the chlorines are located at positions 2, 3, 4, and 6.


Isopentane

An alkane that is butane substituted by a methyl group at position 2.


Barban

A carbamate ester that is 4-chlorobut-2-yn-1-yl ester of N-(3-chlorophenyl)carbamic acid. A herbicide, it is no longer approved for use within the European Community.


TMVA protein, Trimeresurus mucrosquamatus


An oxopurine that is xanthine in which the hydrogen attached to the nitrogen at position 7 is replaced by a methyl group. It is an intermediate metabolite in the synthesis of caffeine.


Kaolin

An aluminosilicate soft white mineral named after the hill in China (Kao-ling) from which it was mined for centuries. In its natural state kaolin is a white, soft powder consisting principally of the mineral kaolinite, and varying amounts of other minerals such as muscovite, quartz, feldspar, and anatase. It is used in the manufacture of china and porcelain and also widely used in the production of paper, rubber, paint, drying agents, and many other products.


EC 4.6.1.1 (adenylate cyclase) inhibitor

An EC 4.6.* (P-O lyase) inhibitor that interferes with the action of enzyme adenylate cyclase (EC 4.6.1.1).


Fenticlor

An aryl sulfide having two 5-chloro-2-hydroxyphenyl groups attached to sulfur; an antiinfective drug mostly used in veterinary medicine.


An enone that is cyclopentanone having a C=C double bond at position 2.


Colestolone

A 3beta-hydroxysteroid consisting of 3beta-hydroxy-5alpha-cholest-8(14)-ene having an additional oxo group at the 15-position.


N-Bromosuccinimide

A five-membered cyclic dicarboximide compound having a bromo substituent on the nitrogen atom.


Deanol

A  tertiary amine that is ethanolamine having two N-methyl substituents.


A sulfonamide resulting from the formal condensation of the sulfonic acid group of mesitylene-2-sulphonic acid with the amino group of 2-(m-bromophenyl)ethylamine in which the nitrogen is substituted by a 4-[m-(methylsulfonyl)phenyl]benzyl group.


Diphenoxylate

A piperidinecarboxylate ester that is the ethyl ester of difenoxin.


p-Anisaldehyde

A member of the class of benzaldehydes consisting of benzaldehyde itself carrying a methoxy substituent at position 4.


Diphenyl ether

An aromatic ether in which the oxygen is attached to two phenyl substituents. It has been found in muscat grapes and vanilla.


Palonosetron

An organic heterotricyclic compound that is an antiemetic used (as its hydrochloride salt) in combination with netupitant (under the trade name Akynzeo) to treat nausea and vomiting in patients undergoing cancer chemotherapy.


A tetracyclic triterpenoid that is lanost-8-ene carrying hydroxy and oxo substituents at positions 3beta and 30 respectively.


Bupirimate

A member of the class of aminopyrimidines that is 2-ethylaminopyrimidine carrying methyl, butyl and dimethylaminosulfooxy substituents at posiitons 4, 5 and 6 respectively.


Butafenacil

An organofluorine compound that is 1-methyl-6-(trifluoromethyl)pyrimidine-2,4(1H,3H)-dione substituted by a 4-chloro-3-({[2-methyl-1-oxo-1-(prop-2-en-1-yloxy)propan-2-yl]oxy}carbonyl)phenyl group at position 3. It is a herbicide which inhibits the protoporphyrinogen-oxidase enzyme in plant chloroplasts, resulting in rapid knockdown of various broadleaf and grass weeds.


Ethane

An alkane comprising of two carbon atoms.


2,2-dimethyl-3-(4-(naphthalen-2-ylamino)phenyl)-3-(1,2,4)triazol-1-yl-propionic acid methyl ester


Zwitterionic form of 3-guanidinopropanoic acid having an anionic carboxy group and a protonated imine nitrogen.


Chlophedianol

A diarylmethane that is 2-chlorophenyl(phenyl)methane substituted on the methane carbon by a 2-(dimethylamino)ethyl group. Used in the treatment of dry cough, it suppresses the cough reflex by a direct effect on the cough centre in the medulla of the brain.


Dimyristoylphosphatidic acid

A phosphatidic acid in which the phosphatidyl acyl groups are both myristoyl.


Betahistine

An aminoalkylpyridine that is pyridine substituted by a 2-(methylamino)ethyl group at position 2. It acts as a histamine agonist and a vasodilator, and is thought to improve the microcirculation of the labyrinth, resulting in reduced endolymphatic pressure. It is used (generally as the hydrochloride or mesylate salt) to reduce the symptoms of vertigo, tinnitus, and hearing loss associated with Meniere's disease.


A butanediol compound having two hydroxy groups in the 1- and 3-positions.


antilipemic drug

A substance used to treat hyperlipidemia (an excess of lipids in the blood).


Eseroline

A pyrroloindole that is 1,2,3,3a,8,8a-hexahydropyrrolo[2,3-b]indole substituted by methyl groups at positions 1, 3a and 8 and a hydroxy group at position 5. It is a metabolite of physostigmine and causes neuronal cell death by a mechanism involving loss of cell ATP.


Eliglustat

A carboxamide obtained by formal condensation of the carboxy group of octanoic acid with the primary amino group of (1R,2R)-2-amino-1-(2,3-dihydro-1,4-benzodioxin-6-yl)-3-(pyrrolidin-1-yl)propan-1-ol. A ceramide glucosyltransferase inhibitor used (as its tartrate salt) for treatment of Gaucher's disease.


Napropamide

A racemate composed of equimolar amounts of (S)- and (R)-napropamide.


A benzenetriol that is acetophenone in which the hydrogens at positions 2, 4, and 6 on the phenyl group are replaced by hydroxy groups. It is used as a matrix in matrix-assisted laser desorption/ionization (MALDI) mass spectrometry for the analysis of acidic glycans and glycopeptides.


Bifenazate

A carboxylic ester obtained by formal condensation of 2-(4-methoxy[1,1'-biphenyl]-3-yl)hydrazinecarboxylic acid with 2-propanol.


Aclonifen

A primary amino compound that is aniline in which the phenyl group has been substituted at positions 2, 3, and 6 by chlorine, phenoxy, and nitro groups, respectively. A protoporphyrinogen oxidase (PPO) inhibitor, it is used as a herbicide against a broad range of weeds in a wide range of crops.


A member of the class of dimethylanilines that is N,N-dimethylaniline having a nitroso group at the 4-position.


A nucleobase analogue that is uracil in which the oxo group at C-2 is replaced by a thioxo group.


Isonicotinic acid

A pyridinemonocarboxylic acid in which the carboxy group is at position 4 of the pyridine ring.


Tandospirone

A dicarboximide that is (3aR,4S,7R,7aS)-hexahydro-1H-4,7-methanoisoindole-1,3(2H)-dione which is substituted by a 4-[4-(pyrimidin-2-yl)piperazin-1-yl]butyl group at position 2. It is a potent and selective 5-HT1A receptor partial agonist (Ki = 27 nM).


A compound having the structure RC#N; thus a C-substituted derivative of hydrocyanic acid, HC#N. In systematic nomenclature, the suffix nitrile denotes the triply bound #N atom, not the carbon atom attached to it.


A member of the class of  thiadiazoles  that is 1,3,4-thiadiazole substituted by pyrazin-2-yl and (2,6-dichlorobenzyl)sulfanediyl groups at positions 2 and 5, respectively. It is a selective activator of mechanosensitive channel piezo1.


paraben

A 4-hydroxybenzoate ester in which the esterifying alcohol is an alkanol (in diagram, R = alkyl). Commonly used as preservatives in cosmetic and pharmaceutical products.


An azabicycloalkane that is (1R,4R)-2,5-diazabicyclo[2.2.1]heptane which is substituted at position 2 by a 3-(2-hydroxyphenyl)-3-oxoprop-1-en-1-yl group and at position 5 by a pyridin-2-yl group. It is a potent and selective inhibitor of polybromo 1 (Kd = 48 nM), SMARCA2 and SMARCA4 (Kd = 89 nM) bromodomains.


Monomethyl succinate

A dicarboxylic acid monoester that is succinic acid in which one of the carboxy groups has been converted to its methyl ester.


acaricide

A substance used to destroy pests of the subclass Acari (mites and ticks).


3,5-Dihydroxybenzoic acid

A dihydroxybenzoic acid in which the hydroxy groups are located at positions 3 and 5.


Lucidenic acid N

A  tetracyclic triterpenoid that is 25,26,27-trinorlanost-8-en-24-oic acid substituted by hydroxy groups at positions 3 and 7 and oxo groups at positions 11 and 15 respectively (the 3beta,5alpha,7beta stereoisomer). Isolated from the fruiting bodies of Ganoderma lucidum, it exhibits cytotoxicity against tumour cells.


CARIPRAZINE

An N-alkylpiperazine that is N,N-dimethyl-N'-{trans-4-[2-(piperazin-1-yl)ethyl]cyclohexyl}urea substituted at position 4 on the piperazine ring by a 2,3-dichlorophenyl group. Used (as the hydrochloride salt) for treatment of schizophrenia and bipolar disorder.


Butanoic acid, [(diethoxyphosphinyl)oxy]methyl ester


A member of the class of phenols that phenol substituted by methyl groups at positions 2 and 5.


muscarinic antagonist

A drug that binds to but does not activate muscarinic cholinergic receptors, thereby blocking the actions of endogenous acetylcholine or exogenous agonists.


A monomethoxybenzene that is dopamine in which the hydroxy group at position 4 is replaced by a methoxy group.


Lysine tyrosylquinone

An L-lysine derivative in which one of the amino hydrogens at N(6)-amino is substituted by a 6-[(2S)-2-amino-2-carboxyethyl]-3,4-dioxocyclohexa-1,5-dien-1-yl group.


Barbituric acid

A barbiturate, the structure of which is that of perhydropyrimidine substituted at C-2, -4 and -6 by oxo groups.  Barbituric acid is the parent compound of barbiturate drugs, although it is not itself pharmacologically active.


A triazolopyrimidine that consists of 3,6-dihydro-7H-[1,2,3]triazolo[4,5-d]pyrimidine bearing amino and oxo substituents at positions 5 and 7 respectively.


A hydrochloride obtained by reaction of 3beta-(2-diethylaminoethoxy)androst-5-en-17-one with one equivalent of hydrochloric acid. It is a cholesterol synthesis and transport inhibitor.


Myrsinoic acid B

A member of the class of 1-benzofurans that is 2,3-dihydro-1-benzofuran substituted by a carboxy group at position 5, a 1',5'-dimethyl-1'-hydroxy-4'-hexenyl group at position 2 and a prenyl group at position 7. Isolated from Myrsine seguinii, it exhibits anti-inflammatory activity.


Actinidine

A member of the class of cyclopentapyridines that is 6,7-dihydrocyclopenta[c]pyridine bearing two methyl substituents at positions 4 and 7.


arabinoxylan

A member of the class of arabinoxylans that consists of a polymer chain of beta-(1->4)-linked D-xylopyranose units, many of which are 2- or 3-substituted, or 2,3-disubstituted by alpha-L-arabinofuranosyl residues.


Otosenine

A pyrrolizine alkaloid that is produced by several Jacobaea and Senecio species.


Cobalt nitrate

A cobalt salt in which the cobalt metal is in the +2 oxidation state and the counter-anion is nitrate.


Tioxolone

A 1,3-benzoxathiole having a hydroxy substituent at the 6-position.


Acrivastine

A member of the class of pyridines that is (pyridin-2-yl)acrylic acid substituted at position 6 by a [(1E)-1-(4-methylphenyl)-3-(pyrrolidin-1-yl)prop-1-en-1-yl group. It is a non-sedating antihistamine used for treatment of hayfever, urticaria, and rhinitis.


An N-alkylpiperazine that is butane which is substituted by a 3,5-dioxopiperazin-1-yl group at positions 2 and 3. The meso isomer.


Ppads tetrasodium salt

An organic sodium salt that is the tetrasodium salt of 5'-phosphopyridoxal-6-azobenzene-2,4-disulfonic acid


Dynasore

A carbohydrazide resulting from the formal condensation of the hydrazone moiety of 3,4-dihydroxybenzaldehyde hydrazone with the carboxy group of 3-hydroxy-2-naphthoic acid. It is a cell-permeable, reversible noncompetitive inhibitor of the GTPase activity of dynamin 1 and 2 and Drp1 (mitochondrial), while exhibiting no significant effect against two other small GTPases, MxA and Cdc42.


Luteolin 3'-o-glucuronide

A luteolin glucosiduronic acid consisting of luteolin having a beta-D-glucosiduronic acid residue attached at the 3'-position.


lificiguat

A member of the class of indazoles that is 1H-indazole which is substituted by a benzyl group at position 1 and a 5-(hydroxymethyl)-2-furyl group at position 3. It is an activator of soluble guanylate cyclase and inhibits platelet aggregation.


A member of ther class of ureas that is urea in which a hydrogen attached to one of the nitrogens has been replaced by an N-methylindol-5-yl group, while a hydrogen attached to the other nitrogen has been replaced by a 3-methyl-1,2-thiazol-5-yl group. It is a potent and selective antagonist for the 5-hydroxytryptamine 2B (5-HT2B) receptor.


Quinoline Yellow

A quinoline derivative with a 1,3-dioxoindan-2-yl substituent at C-2.


N,N'-Diphenyl-p-phenylenediamine

An N-substituted diamine that is 1,4-phenylenediamine in which one hydrogen from each amino group is replaced by a phenyl group.


A 7-hydroxyisoflavone that is daidzein  substituted by a hydroxy group at position 3'.


Quercetin 3,4'-dimethyl ether

A dimethoxyflavone that is the 3,4'-dimethyl ether derivative of quercetin. Isolated from Combretum quadrangulare, it exhibits antineoplastic activity.


Thiosultap

A nereistoxin analogue insecticide that is 2-(dimethylamino)propane-1,3-dithiol with both sulfhydryls bearing sulfate groups.


A member of the class of hydroxybiphenyls carrying hydroxy groups at positions 2 and 2'.


Phosphomethylphosphonic acid adenosyl ester


A member of the class of chalcones that is trans-chalcone substituted by a hydroxy group at position 2'.


Fertilysin

A carboxamide that is 1,8-diaminooctane in which a hydrogen attached to each of the amino groups has been replaced by a dichloroacetyl group. Inhibitor of aldehyde dehydrogenase 1a2 (ALDH1a2). Inhibits the biosynthesis of retinoic acid from retinol in neonatal and adult murine testis. It down-regulates sex related genes in zebrafish.


Pratensein

A member of the class of 7-hydroxyisoflavones in which isoflavone is substituted by hydroxy groups at the 5, 7, and 3' positions, and by a methoxy group at the 4' position.


2-(2-oxo-2-((3,7,11-trimethyl-2,6,10-dodecatrienyl)oxy)aminoethyl)phosphonic acid, (2,2-dimethyl-1-oxopropoxy)methyl ester sodium


An organochlorine compound comprising 2'-deoxyguanosine having a chloro substituent at position 8 of the guanine ring system.


A secondary amino compound consisting of two molecules of tacrine that are linked together through their exocyclic amino groups by a heptane-1,7-diyl chain. Bis(7)-tacrine is an acetylcholinesterase (AChE)inhibitor (IC50 0.40 nM, >1,000 times more potent than tacrine). It has also been found to protect against H2O2 -induced apoptosis in rat pheochromocytoma cells.


A dichlorobiphenyl carrying chloro groups at positions 4 and 4' respectively.


An alanine derivative obtained by replacement of one of the methyl hydrogens in alanine with a cyano group


2'-Deoxyadenosine 5'-triphosphate

A purine 2'-deoxyribonucleoside 5'-triphosphate having adenine as the nucleobase.


Diphosphomethylphosphonic acid adenosyl ester


Forchlorfenuron

A member of the class of phenylureas that is urea substituted by a phenyl group and a 2-chloropyridin-4-yl group at positions 1 and 3 respectively. It is a plant growth regulator widely used in agriculture for improving fruit quality and fruit size.


Salicyl alcohol

A hydroxybenzyl alcohol that is phenol substituted by a hydroxymethyl group at C-2.


A beta-D-glucosiduronic acid having a 4-nitrophenyl substituent at the anomeric position.


Mescaline

A phenethylamine alkaloid that is phenethylamine substituted at positions 3, 4 and 5 by methoxy groups.


DEMECLOCYCLINE

Tetracycline which lacks the methyl substituent at position 7 and in which the hydrogen para- to the phenolic hydroxy group is substituted by chlorine. Like tetracycline, it is an antibiotic, but being excreted more slowly, effective blood levels are maintained for longer. It is used (mainly as the hydrochloride) for the treatment of Lyme disease, acne and bronchitis, as well as for hyponatraemia (low blood sodium concentration) due to the syndrome of inappropriate antidiuretic hormone (SIADH) where fluid restriction alone has been ineffective.


Cyclohexyl isocyanate

An isocyanate comprising a cyclohexane core with a single isocyanato substituent.


A monocarboxylic acid that is the 5-hydroxylated metabolite of diclofenac.


A D-glucopyranose 1-phosphate in which the anomeric centre has alpha-configuration.


4-Methylumbelliferyl glucuronide

A beta-D-glucosiduronic acid having a 4-methylumbelliferyl substituent at the anomeric position. A hyaluronan synthesis inhibitor, it is  anti-tumourigenic for various malignant tumours.


Telaprevir

An oligopeptide consisting of N-(pyrazin-2-ylcarbonyl)cyclohexylalanyl, 3-methylvalyl, octahydrocyclopenta[c]pyrrole-1-carboxy, and 3-amino-N-cyclopropyl-2-oxohexanamide residues joined in sequence. Used for treatment of chronic hepatitis C virus genotype 1 infection.


Flavin mononucleotide

A flavin mononucleotide that is riboflavin (vitamin B2) in which the primary hydroxy group has been converted to its dihydrogen phosphate ester.


Lumiflavin

A compound showing yellow-green fluorescence, formed by a photolysis of riboflavin in alkaline solution.


Amprolium ion

A pyridinium ion that is the cationic portion of amprolium, a veterinary drug which is used for prevention of coccidiosis in poultry and cattle.


Amobarbital

A member of the class of  barbiturates that is pyrimidine-2,4,6(1H,3H,5H)-trione substituted by a 3-methylbutyl and an ethyl group at position 5. Amobarbital has been shown to exhibit sedative and hypnotic properties.


Caproic Acid

A C6, straight-chain saturated fatty acid.


A steroid glucosiduronic acid that is estriol in which the phenolic hydrogen has been replaced by a beta-D-glucuronyl residue.


A pyrimidone that is uracil which is substituted by a 2-hydroxyethoxymethyl group at position 1 and a benzyl group at position 5.


Lipiarmycin

An 18-membered macrolide that is a fermentation product obtained from the Actinomycete Dactylosporangium aurantiacum. A narrow spectrum antibiotic used for treatment of Clostridium difficile-related infections.


fructus schizandrae, radix ginseng, radix ophiopogonis drug combination


p-Cresol glucuronide

A glucosiduronic acid that is beta-D-glucuronic acid in which the anomeric hydroxyl hydrogen is replaced by a p-tolyl group.


Acetanilide

A member of the class of acetamides that is acetamide in which one of the hydrogens attached to the nitrogen is substituted by a phenyl group.


Any organonitrogen heterocyclic compound based on a pyridine skeleton and its substituted derivatives.


Tenoxicam

A thienothiazine-derived monocarboxylic acid amide obtained by formal condensation of the carboxy group of 4-hydroxy-2-methylthieno[2,3-e][1,2]thiazine-3-carboxylic acid 1,1-dioxide with the amino group of 2-aminopyridine.  Used for the treatment of pain and inflammation in osteoarthritis and rheumatoid arthritis. It is also indicated for short term treatment of acute musculoskeletal disorders including strains, sprains and other soft-tissue injuries.


Dichlorphenamide

A sulfonamide that is benzene-1,3-disulfonamide in which the hydrogens at positions 4 and 5 are substituted by chlorine. An oral carbonic anhydrase inhibitor, it partially suppresses the secretion (inflow) of aqueous humor in the eye and so reduces intraocular pressure. It is used for the treatment of glaucoma.


Purpurogalline

A cyclic ketone that is 5H-benzocycloheptene bearing an oxo group at position 5 and hydroxy groups at positions 2, 3, 4 and 6.