117903-07-8 3(2H)-Pyridazinone, 4,5-dihydro-5-(4-aminophenyl)-6-methyl- 3(2H)-Pyridazinone, 5-(4-aminophenyl)-4,5-dihydro-6-methyl- 4,5-Dihydro-5-(4-aminophenyl)-6-methyl-3(2H)-pyridazinone 5-(p-Aminophenyl)-6-methyl-4,5-dihydro-3(2H)-pyridazinone