《英文msh词典》Compounds,2-Ring Heterocyclic
[入口词] Compounds,2-Ring Heterocyclic
[主题词] Heterocyclic Compounds,2-Ring
[英文释义] 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.