4-(2-Hydroxyphenylazo)-3-methyl-1-phenyl-2-pyrazolin-5-one;Phenol-<2azo4>-{3-methyl-1-phenyl-pyrazolon-(5)};3-Methyl-1-phenyl-4-(o-phenolazo)-5-pyrazolon;5-methyl-2-phenyl-2H-pyrazole-3,4-dione 4-[(2-hydroxy-phenyl)-hydrazone];4-(2'-hydroxybenzeneazo)-3-methyl-1-phenyl-5-pyrazolone;
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