1 9G4 1-{4-[(acetylamino)methyl]phenyl}-4-(4-chlorophenoxy)-6-oxo-1,6-dihydropyridazine-3-carboxamide 1.000 2 41I 4-(4-chlorophenoxy)-6-oxo-1-phenyl-1,6-dihydropyridazine-3-carboxamide 0.828