4-ethyl-7-(methylsulfonyl)-1-phenyl-1H-imidazo<4,5-d>pyridazine

2-(3-Phenyl-3H-imidazo[4,5-d]pyridazin-4-yl)-malonic acid diethyl ester

1-phenyl-1H-imidazo<4,5-d>pyridazine-7(6H)-thione

5-amino-4-anilino-3-chloropyridazine

7-methoxy-1-phenyl-1H-imidazo<4,5-d>pyridazine