SEARCH Articles Figures Tables Aromatic Five-Membered Ring Heterocyclics Aromaticity aromatic heterocycles Aromaticity heterocyclics Aromaticity of heterocyclic rings Five-membered ring heterocycles, relative aromaticity HETEROCYCLES FUSED TO TWO AROMATIC RINGS Heterocycles aromatic Heterocycles aromatization Heterocyclic aromatic rings Heterocyclic aromatics Non-Aromatic Heterocycles with sp2 Ring Carbons Other Aromatic Six-Membered Ring Heterocyclics Selenophens Fused to Six-membered Heterocyclic Aromatic Rings Six-membered aromatic heterocycles can have oxygen in the ring