3(2H)-Pyridazinone, 4,5-dihydro-6-methyl-5-phenyl- 35991-33-4 4,5-Dihydro-6-methyl-5-phenyl-3(2H)-pyridazinone 5-24-03-00308 (Beilstein Handbook Reference) 5-Phenyl-6-methyl-4,5-dihydro-3(2H)-pyridazinone BRN 0745436