Listing 4825 chemical categories

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Name	ChemOnt ID	Description
Ranaconitine-type diterpenoid alkaloids	CHEMONTID:0003790	C18-bisnorditerpenoid alkaloids with a structure based on the heptacyclic lycoctonine skeleton. Lappaconitine similar to aconitane, with the difference that the former lacks a carbon atom at the 18-position.
Resorcinols	CHEMONTID:0000137	Compounds containing a resorcinol moiety, which is a benzene ring bearing two hydroxyl groups at positions 1 and 3.
Retinoid esters	CHEMONTID:0001575	Ester derivatives of retinoic acid. These are obtained by formal condensation of the hydroxy group of retinol with the carboxy group of any carboxylic acid.
Retinoids	CHEMONTID:0001606	Oxygenated derivatives of 3,7-dimethyl-1-(2,6,6-trimethylcyclohex-1-enyl)nona-1,3,5,7-tetraene and derivatives thereof.
Retro-dihydrochalcones	CHEMONTID:0003475	A form of normal dihydrochalcones that are structurally distinguished by the lack of oxygen functionalities at the C2'- and C6'-positions.
Retrochalcones	CHEMONTID:0003474	A form of normal chalcones that are structurally distinguished by the lack of oxygen functionalities at the C2'- and C6'-positions.
Rhamnofolane and daphnane diterpenoids	CHEMONTID:0003494	Diterpenoids with a structure based on one the rhamnofolane or daphnane skeleton. The rhamnofolane and daphnane skeletons are closely related, being formally derived from casbane by two cyclizations (6,10 and 5,14) followed by cleavage of the 1,15 (daphnane) or 2,15 (rhamnofolane) cyclopropane bonds.
Rhamnolipids	CHEMONTID:0001765	Glycolipids structurally characterized by a glycosyl head group, in this case a rhamnose moiety, and a 3-(hydroxyalkanoyloxy)alkanoic acid (HAA) fatty acid tail.
Rhazinilam alkaloids	CHEMONTID:0002758	Alkaloids with a structure based on the rhazinilam skeleton, a tetracyclic compound with a complex tetracyclic carbon skeleton containing pyrrole ring embedded in its indolizine core.
Rhoeadine alkaloids	CHEMONTID:0002658	Alkaloids with a structure based on rhoeadine. They usually contain a benzazepine system fused with a six-membered hemiacetal or acetal.
Ribonucleoside 3'-phosphates	CHEMONTID:0004404	Ribonucleosides that contain a phosphate group attached to the C-3 carbon of the ribose or deoxyribose moiety. The nucleobases here are limited to purine, pyrimidine, and pyridine derivatives.
Ribonucleoside phosphoramidites	CHEMONTID:0004364	Ribonucleoside analogues that consist of a nucleobase (usually purine or pyrimidine), linked to a ribose or deoxyribose, which is protected at the 2',3', or 5'-position by a phosphoramidite group.
Rotenoid O-glycosides	CHEMONTID:0001741	Compounds containing a carbohydrate moiety glycosidically linked to the rotenoid backbone at the C8-position.
Rotenoids	CHEMONTID:0001607	Phenolic compounds containing a cis-fused tetrahydrochromeno[3,4-b]chromene nucleus. Many rotenoids contain an additional ring, e.g. rotenone. They are isoflavonoids characterized by the presence of an extra carbon atom in an additional heterocyclic ring.
Rotenones	CHEMONTID:0003528	Rotenoids with a structure based on a 6a,12a-dihydrochromeno[3,4-b]chromen-12(6H)-one skeleton.
Rotundane sesquiterpenoids	CHEMONTID:0003563	Sesquiterpenoids with a structure based on the rotundane skeleton, which arise by a C10-C12 cyclization of bicyclic guaiane skeleton.