4-Methyl-6-phenyl-2H-pyridazin-3-on, 4-methyl-6-phenyl-2H-pyridazin-3-one, 6-phenyl-4-methyl-2,3-dihydropyridazin-3-one, methyl-4 phenyl-6 pyridazone-3, EINECS 236-322-5,
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