3(2H)-Pyridazinone, 4-methyl-2-(4-methyl-1-piperazinylethyl)-6-phenyl-, dihydrochloride 31139-26-1 4-Methyl-2-(4-methyl-1-piperazinylethyl)-6-phenyl-3(2H)pyridazinone dihydrochloride AG 266