1-phenyl-3-methyl-4-(2-hydroxy-5-nitrophenylazo)pyrazol-5-one;5-methyl-2-phenyl-2H-pyrazole-3,4-dione 4-[(2-hydroxy-5-nitro-phenyl)-hydrazone];3-Methyl-1-phenyl-4-(4-nitro-o-phenolazo)-5-pyrazolon;4-(2-Hydroxy-5-nitrophenylazo)-3-methyl-1-phenyl-2-pyrazolin-5-one;Einecs 238-909-1;
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