Fused rings




Indole

Indoline

Isoindole



Benzofuran

Isobenzofuran

Benzothiophene



1H-Indazole

Benzimidazole

Purine



Benzoxazole

Benzothiazole




Quinoline

Isoquinoline

Tetrahydroquinoline



1,8-Naphthyridine

Quinoxaline

Quinazoline



Cinnoline

Phthalazine

Pteridine




Carbazole

Acridine



Phenazine

Phenothiazine


Phenoxazine