【化学】杂环氧-氮化合物，稠环的

heterocyclic

eight member ring heterocyclic compound【有化】

eight-membered rings, heterocyclic

heterocyclic compound

heterocyclic compounds

STEROIDS in which one or more carbocyclic rings are replaced by heterocyclic rings

anthracene dyes, condensed, heterocyclic

sulphur ring with at least one heterocyclic ring