2-(3,4-Dimethylphenyl)-5-methyl-2,4-dihydro-3H-pyrazol-3-one; 1-(3,4-Dimethylphenyl)-3-methyl-1H-pyrazol-5(4H)-one; 3-Methyl-1-(3,4-dimethylphenyl)-2-pyrazolin-5-one; Eltrombopag Impurity 18;