"Heterocyclic_Compound"^^ . . "Organic Chemical"^^ . "Ring compounds having atoms other than carbon in their nuclei. (Grant & Hackh's Chemical Dictionary, 5th ed)MSH2002_06_01" . . . "Chemical Viewed Structurally"^^ . "CHEBI:5686"^^ . "Heterocyclic CompoundPTNCI" . "Heterocyclic Compound"^^ . "Heterocyclic Compound"^^ . "C0019398"^^ . . "C542"^^ .