heteroarene
compound containing at least two different elements in the same aromatic ring
diazine
any aromatic, heterocyclic compound having a six-membered aromatic ring with two nitrogen heteroatoms
triazine
family of aromatic, heterocyclic compounds
azole
any heterocyclic compound having a five-membered aromatic ring with at least one nitrogen heteroatom
azine
aromatic compound having a six-membered ring consisting of one or more nitrogen atoms