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Select 'All' to list all the chemical categories. Each character links to a view of all chemical categories whose name begin by it. The asterisk (*) links to a view of all categories whose name start with a special character (e.g. '('). You can search the table for a specific string within that specific view.
NameChemOnt IDDescription
QuassinoidsCHEMONTID:0002119A group of compounds chemically degraded from triterpenes. According to their basic skeleton, quassinoids are categorized into five distinct groups, C-18, C-19, C-20, C-22 and C-25 types. The C-20 quassinoids can be further classified into two types, tetracyclic and the pentacyclic. The tetracyclic variety does not have oxygenation at C-20, while the pentacyclic quassinoids possess additional oxygenation at C-20 that allows for the formation of an additional ring.
Quaternary ammonium saltsCHEMONTID:0000503Compounds containing positively charged polyatomic ion of the structure NR4+, R being an alkyl group or an aryl group.
Quaternary benzophenanthridine alkaloidsCHEMONTID:0002669Alkaloids containing a quaternary N-demethylbenzophenanthridine skeleton, where the nitrogen atom of the phenanthridine moiety is part of four bonds.
Quebrachamine alkaloidsCHEMONTID:0002757Alkaloids with a structure based on the quebrachamine skeleton, a tetracyclic compound that is derived by fission of the 7,21 bond of the aspidospermidine skeleton. Some quebrachamine alkaloids lack the C-16 methoxycarbonyl group.
QuinacridinesCHEMONTID:0001728Compounds containing a quinacridine moiety, which consists of a quinoline fused to an acridine.
QuinacridonesCHEMONTID:0001809Compounds containing a quinacridone skeleton, which consists of a quinoline fused to an acridone.
QuinazolinaminesCHEMONTID:0002314Heterocyclic aromatic compounds containing a quianazoline moiety substituted by one or more amine groups.
QuinazolinesCHEMONTID:0000485Compounds containing a quinazoline moiety, which is made up of two fused six-member aromatic rings, a benzene ring and a pyrimidine ring.
QuindolinesCHEMONTID:0004168Organic compounds containing an indole and a quinoline, where the pyrrole moiety of the indole is fused to the pyridine moiety of the quinoline.
Quinic acids and derivativesCHEMONTID:0002512Compounds containing a quinic acid moiety (or a derivative thereof), which is a cyclitol made up of a cyclohexane ring that bears four hydroxyl groups at positions 1,3.4, and 5, as well as a carboxylic acid at position 1.
QuinodimethanesCHEMONTID:0001579Compounds containing a cyclohexene or cyclohexadiene ring that bears two methylidene groups.
QuinolidinesCHEMONTID:0003787Organic compounds containing a quinolidine or decahydroquinoline moiety, which is a bicyclic skeleton consisting of a piperidine fused to a cyclohexane ring.
Quinoline carboxamidesCHEMONTID:0002553Quinolines in which the quinoline ring system is substituted by one or more carboxamide groups.
Quinoline carboxylic acidsCHEMONTID:0002552Quinolines in which the quinoline ring system is substituted by a carboxyl group at one or more positions.
Quinoline quinonesCHEMONTID:0002570Quinoline derivative with a structure containing a 5,8-dihydroisoquinoline-5,8-dione skeleton.
Quinoline-3-carboxamidesCHEMONTID:0002252Quinolines in which the quinoline ring system is substituted by one carboxamide group at the 3-position.
Quinoline-3-sulfonamidesCHEMONTID:0001513Quinolines in which the quinoline ring system is substituted by one sulfonamide group at the 3-position.
Quinolines and derivativesCHEMONTID:0001253Compounds containing a quinoline moiety, which consists of a benzene ring fused to a pyrimidine ring to form benzo[b]azabenzene.
QuinolizidinesCHEMONTID:0000221Compounds containing a quinolizidine moiety, which is a octahydro-2H-quinolizine derivative.
QuinolizidinonesCHEMONTID:0001325Compounds containing a quinolizidine moiety which bears a ketone group.
Quinolizine carboxylic acids and derivativesCHEMONTID:0002238Compounds containing a carboxylic group attached to a quinolizine moiety.
QuinolizinesCHEMONTID:0000222Compounds containing a quinolizine moiety, which consists of two fused pyridine rings sharing a nitrogen atom.
Quinolo[1,2-a]quinazolinesCHEMONTID:0004333Aromatic heterocyclic compounds containing a quinazoline and a quinoline fused to each other in a configuration so that they share a nitrogen atom.
Quinolones and derivativesCHEMONTID:0000056Compounds containing a quinoline moiety which bears a ketone group.
QuinomethanesCHEMONTID:0000125Organic compounds containing a cyclohexene or cyclohexadiene ring that bears a methylidene group and a ketone group. Isomers include m-quinomethane (6-methylidenecyclohex-2-en-1-one), o-quinomethane (5-methylidenecyclohex-2-en-1-one), and p-quinomethane (4-methylidenecyclohexa-2,5-dien-1-one).
Quinone and hydroquinone lipidsCHEMONTID:0001534Lipids structurally characterized by the presence of a quinone or hydroquinone moiety.
QuinonesCHEMONTID:0002495Compounds having a fully conjugated cyclic dione structure, such as that of benzoquinones, derived from aromatic compounds by conversion of an even number of number of -CH= groups into -C(=O)- groups with any necessary rearrangement of double bonds (polycyclic and heterocyclic analogues are included).
QuinoniminesCHEMONTID:0002892Imines derived from quinones by replacement of one or both oxygens by =NR.
QuinoxalinesCHEMONTID:0000486Compounds containing a quinoxaline moiety, a bicyclic heterocycle made up of a benzene ring fused to a pyrazine ring.
QuinuclidinesCHEMONTID:0000252Compounds containing a 1-azabicyclo[2.2.2]octane moiety.
QuinuclidonesCHEMONTID:0001805Compounds containing a quinuclidine moiety which bears a ketone group.