2-(3,4-Dimethylphenyl)-5-methyl-2,4-dihydro-3H-pyrazol-3-one; 3-Methyl-1-(3,4-dimethylphenyl)-2-pyrazolin-5-one; 2-(3,4-Dimethylphenyl)-2,4-dihydro-5-methyl-3H-pyrazol-3-one;