ClassyFire: Listing 4825 chemical categories

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Name	ChemOnt ID	Description
Eburnan-type alkaloids	CHEMONTID:0002671	Alkaloids with a structure based on the eburnan skeleton, that arises from rearrangement of the aspidospermidine ring system, involving migration of C-21 from C-7 to C-2, fission of the 2,16-bond, and attachment of C-16 to N-1.
Ecdysteroids	CHEMONTID:0004813	Polyhydroxylated oxosteroids possessing a cyclopentano-perhydro-phenantrene with beta side-chain at C-17, which is the product of terpene biosynthesis through mevalonic acid, cholesterol and related sterols. Ecdysteroids are found in certain plants and animals.
Eicosanoids	CHEMONTID:0000513	Unsaturated C20 fatty acids or skeletally related compounds. These include prostaglandins, thromboxanes, leukotrienes and other oxygenated derivatives, which are produced primarily by three classes of enzymes, cyclooxygenases (COX-1 and COX-2), lipoxygenases (LOX) and cytochrome P450 mono-oxygenases.
Elemane sesquiterpenoids	CHEMONTID:0002872	Sesquiterpenoids with a structure based on the elemane skeleton. Elemane is a monocyclic compound consisting of a cyclohexane ring substituted with a methyl group, an ethyl group, and two 1-methylethyl groups at the 1-, 1-, 2-, and 4-position, respectively.
Elemanolides	CHEMONTID:0002242	Compounds structurally characterized by the presence of the elemane backbone containing a lactone ring.
Elisabethane diterpenoids	CHEMONTID:0003559	Diterpenoids with a structure based on the elisabethane skeleton, a tricyclic serrulatane derivative that is formed by connecting the C1 and C9 atom of serrulatane. This class of compounds also includes seco-elisabethane derivatives, nor-elisabethanes (resulting from the loss of one carbon atom), and bisnor-elisabethanes (resulting from the loss of two carbon atoms).
Elisapterane, elisabane, cumbiane or colombiane diterpenoids	CHEMONTID:0003560	Diterpenoids with a structure based on either the elisapterane, elisabane, cumbiane or colombiane skeleton. They derive from serrulatane. Elisapterane is a tetracyclic compound formed by C10-C15 cyclization of elisabethane. Elisabane (nor-elisapterane) results from the loss of the C17 carbon atom of elisapterane. Cumbiane is formed by C10-C16 cyclization of the elisabethane carbon skeleton. Meanwhile, the cleavage of the C15-C16 bond of cumbiane yields the seco-cumbiane skeleton. Colombiane is also a tetracyclic skeleton arises from the C12-C2 cyclization of the elisabethane skeleton.
Ellagic acids and derivatives	CHEMONTID:0000236	Compounds containing an ellagic acid moiety (4,4',5,5',6,6'-Hexahydroxydiphenic acid 2,6,2',6'-dilactone) or a derivative thereof.
Ellipticine alkaloids	CHEMONTID:0001793	Compounds containing a pyrido[4,3-b]carbazole moiety.
Emetine alkaloids	CHEMONTID:0002659	Alkaloids with a structure characterized by the presence of both an isoquinoline and a benzoquinolizidine nuclei.
Enals	CHEMONTID:0002436	An alpha,beta-unsaturated aldehyde of general formula RC=C-CH=O in which the aldehydic C=O function is conjugated to a C=C triple bond at the alpha,beta position.
Enamines	CHEMONTID:0000470	Compounds containing the enamine functional group with the general structure R1N(R2)CR=C(R3)R4.
Endocannabinoids	CHEMONTID:0001103	Arachidonic acid derivatives containing either an N-acetylethanolamine(type 1) or a glycerol(types 2 and 3) moiety attached to the aliphatic tail.
Enediols	CHEMONTID:0000131	Compounds containing the enediol functional group, with the formula HO(R)C=C(R')OH.
Enoate esters	CHEMONTID:0003626	An alpha,beta-unsaturated carboxylic ester of general formula R1C(R2)=C(R3)C(=O)OR4 (R4= organyl compound) in which the ester C=O function is conjugated to a C=C double bond at the alpha,beta position.
Enol ester epoxides	CHEMONTID:0003676	Epoxide containing derivatives of enol esters. They have an acyloxy substituent on either carbon atom of the epoxide ring and their general structure is CC1OC1OC(R)=O, R = H or organyl chain.
Enol esters	CHEMONTID:0002354	Ester derivatives of enols. They have the general formula RC=COC(=O)R' where R, R' = H or organyl group.
Enol ethers	CHEMONTID:0001009	Compounds containing the enol ether functional group, with the formula R3OCR2=CR1.
Enolates	CHEMONTID:0001665	Deprotonated anions of enols. They have diverse forms with either of the general structure [R1]C([R2])=C([R3])[O-], RC([CH2-])=O, or R1C(R1)=COM (M=metal).
Enols	CHEMONTID:0000132	Compounds containing the enol functional group, with the structure HO(R)C=CR'. Ketones that have one or more alpha-hydrogen atoms undergo keto-enol tautomerization, the tautomer being an enol.
Enones	CHEMONTID:0001363	Compounds containing the enone functional group, with the structure RC(=O)CR'.
Enoyl CoAs	CHEMONTID:0003180	Organic compounds containing a coenzyme A substructure linked to an acyl chain.
Enynes	CHEMONTID:0001566	Hydrocarbons containing an alkene and an alkyne group.
Epibatidine analogues	CHEMONTID:0001493	Compounds containing an epibatidine moiety, with a structure characterized by a 2-chloropyridine moiety connected to an 7-azabicyclo[2.2.1]heptane in exo position.
Epigallocatechins	CHEMONTID:0001594	Compounds containing epigallocatechin or a derivative. Epigallocatechin is a flavan-3-ol containing a benzopyran-3,5,7-triol linked to a 3,4,5-hydroxyphenyl moiety.
Epipolythiodioxopiperazines	CHEMONTID:0001790	Compounds containing an epipolythiodioxopiperazine moiety, which consists of a 2,3-dithia-5,7-diazabicyclo[2.2.2]octane-6,8-dione ring system. One distinct characteristics of Epipolythiodioxopiperazines is the presence of unique di- or polysulfide bridges.
Episulfones	CHEMONTID:0004783	Sulfone derivatives containing the thiirane-1, 1-dione moiety.
Epithionitriles	CHEMONTID:0004134	Organoheterocyclic compounds made up of a carbon atom linked to a thiirane ring and a carbonitrile group.
Epothilones and analogues	CHEMONTID:0000161	Macrolides consisting of a 16-member lactone ring conjugated at the carbon 16 with a 1-(2-methyl-1,3-thiazol-4-yl)prop-1-en-2-yl group. Some epothilone analogues containing a lactam ring instead of the lactone ring.
Epoxide amino acids and derivatives	CHEMONTID:0001170	Sugar amino acids containing an oxirane ring between the carboxy- and the amino terminals of the amino acid chain.
Epoxides	CHEMONTID:0000159	Compounds containing a cyclic ether with three ring atoms(one oxygen and two carbon atoms).
Epoxy fatty acids	CHEMONTID:0001537	Fatty acids containing an oxirane ring as part of the aliphatic chain.
Epoxyeicosatrienoic acids	CHEMONTID:0001015	Eicosatrienoic acids containing an oxirane ring as part of its aliphatic chain.
Epoxypiperidines	CHEMONTID:0002530	Heteropolycyclic compounds containing an oxirane fused to a piperidine ring.
Eremophilane, 8,9-secoeremophilane and furoeremophilane sesquiterpenoids	CHEMONTID:0003655	Sesquiterpenoids with a structure based either on the eremophilane skeleton, its 8,9-seco derivative, or the furoeremophilane skeleton. Eremophilanes have been shown to be derived from eudesmanes by migration of the methyl group at C-10 to C-5.
Eremophilanolides and secoeremophilanolides	CHEMONTID:0002047	Compounds containing the eremophilanolide skeleton, which is structurally characterized by a naphtho[2,3-b]furan-2-one ring system or a derivative thereof.
Ergoline and derivatives	CHEMONTID:0002679	Compounds containing an ergoline moiety, which is structurally characterized by he presence of a 4,6,6a,7,8,9,10,10a-octahydroindolo[4,3-fg] quinoline.
Ergopeptams	CHEMONTID:0002193	Tripeptidic noncyclol ergot alkaloids. The structure of ergopeptams is similar to ergopeptines except that L-proline is exchanged by D-proline, and the tripeptide chain is a noncyclol lactam.
Ergopeptines	CHEMONTID:0002030	Ergoline derivatives that contain a tripeptide structure attached to the basic ergoline ring in the same location as the amide group of the lysergic acid derivatives.
Ergostane steroids	CHEMONTID:0003567	Steroids with a structure based on the ergostane skeleton, which arises from the methylation of cholestane at the 24-position.
Ergosterols and derivatives	CHEMONTID:0001403	Steroids containing ergosta-5,7,22-trien-3beta-ol or a derivative thereof, which is based on the 3beta-hydroxylated ergostane skeleton.
Ergotamines, dihydroergotamines, and derivatives	CHEMONTID:0000371	Organic compounds containing an ergotamine moiety, which is structurally characterized by a benzyl substituent attached to the piperazine ring of the ergopeptine backbone.
Ervatamia alkaloids	CHEMONTID:0003757	Alkaloids with a structure based on the tetracyclic ervatamia skeleton, which arises from the 5,6- bond cleavage and 6,16- bond formation in the vobasine skeleton.
Erythrina alkaloids	CHEMONTID:0001782	Organic compounds with a structure based on a backbone containing a indole-6-ol sharing its nitrogen atom with an isoquinoline ring system.
Erythrinanes	CHEMONTID:0002780	Erythrina alkaloids possessing either a 6-5-6-6-membered indoloisoquinoline core or a derivative thereof.
Estrane steroids	CHEMONTID:0001466	Steroids with a structure based on the estrane skeleton.
Estrogens and derivatives	CHEMONTID:0003570	Steroids with a structure containing a 3-hydroxylated estrane.
Ethers	CHEMONTID:0000254	Compounds bearing an ether group with the formula Compounds ROR (R not H).
Ethoxyethynyl alcohols	CHEMONTID:0004564	Organic compounds containing an ethoxyethynyl group substituted with an alcohol group.
Ethylene bisdithiocarbamates	CHEMONTID:0004177	Dithiocarbamic acids (or derivatives) resulting from the formal addition of a molecule of carbon disulfide to each amino group of ethylenediamine. In addition, compounds containing a 1,2-ethanediyl carbamodithioate moiety are also members of this class.
Eudesmane, isoeudesmane or cycloeudesmane sesquiterpenoids	CHEMONTID:0000101	Sesquiterpenoids with a structure based on the eudesmane skeleton.
Eudesmanolides, secoeudesmanolides, and derivatives	CHEMONTID:0001772	Terpenoids with a structure based on the eudesmanolide (a 3,5a,9-trimethyl-naphtho[1,2-b]furan-2-one derivative) or secoeudesmanolide (a 3,6-dimethyl-5-(pentan-2-yl)-1-benzofuran-2-one derivative) skeleton.
Eunicellane and asbestinane diterpenoids	CHEMONTID:0002916	Diterpenoids with a structure based on either the eunicellane (5,14-cyclocembrane) or the asbestinane skeleton.