"C1519100"^^ . "C1933"^^ . "Chemical Viewed Structurally"^^ . "Ring CompoundPTNCI" . "Ring Compound"^^ . "A cyclic compound. any compound in which the constituent atoms, or any part of them, form a ring. Used mainly in organic chemistry. SYN closed chain compound, ring compound.NCI" . . "Ring_Compound"^^ . "Ring Compound"^^ . .