4,5-DIHYDRO-6-METHYL-2-PHENYL-3(2H)-PYRIDAZINONE, 6-methyl-2-phenyl-4,5-dihydro-2H-pyridazin-3-one, 6-Methyl-2-phenyl-2,3,4,5-tetrahydro-3-pyridazinone, 6-Methyl-2-phenyl-2,3,4,5-tetrahydropyridazinon-3, 6-methyl-2-phenyl-2,3,4,5-tetrahydropyridazin-3-one, 6-Methyl-2-phenyl-4,5-dihydro-2H-pyridazin-3-on