Heterocyclic Building Blocks
Acridines | Benzodioxanes | Benzoxazines | Carbazoles | Coumarins | Furans | Other Heterocyclic | Imidazoles | Indazoles | Indoles | Isoquinolines | Isoxazoles | Morpholines | Oxadiazoles | Oxazoles | Piperazines | Piperidines | Piperidones | Purines | Pyrans | Pyrazines | Pyrazoles | Pyridazines | Pyridines | Pyrimidines | Pyrroles | Quinaldines | Quinazolines | Quinolines | Quinoxalines | Tetrazoles | Thiadiazoles | Thiazines | Thiazoles | Thiophenes | Triazines | Triazoles