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


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