3(2H)-Pyridazinone, 4,5-dihydro-6-(4-(4-pyridinylamino)phenyl)-, monohydrochloride 4,5-Dihydro-6-(4-(4-pyridinylamino)phenyl)-3(2H)-pyridazinone monohydrochloride 6-(4-(4'-Pyridyl)aminophenyl)-4,5-dihydro-3(2H)-pyridazinone hydrochloride 98326-33-1 MCI 154