[A class of organic compounds containing two ring structures, one of which is made up of more than one kind of atom, usually carbon plus another atom. The heterocycle may be either aromatic or nonaromatic. ( NCI )]
UMLS (NCI) C0019400 Relation/PAR: Heterocyclic Compound
Relation/CHD: benzazepine
benzimidazole
benzofuran
benzopyran
benzothiadiazine
Benzoxazoles
Indazoles
Indole
2 benzazine
Naphthyridines
pteridine
purine
quinazoline
1 benzazine
quinolizine
Quinoxalines
Bicyclo Compounds, Heterocyclic