2-Pyrazolin-5-one,4-[(2-hydroxy-4-nitrophenyl)azo]-3-methyl-1-phenyl- (6CI,7CI,8CI);3H-Pyrazol-3-one,2,4-dihydro-4-[(2-hydroxy-4-nitrophenyl)azo]-5-methyl-2-phenyl- (9CI);1-Phenyl-3-methyl-4-(2'-hydroxy-4'-nitrophenylazo)-5-pyrazolone;4-(2-Hydroxy-4-nitrophenylazo)-1-phenyl-3-methylpyrazolone;4-(2'-Hydroxy-4'-nitrophenylazo)-1-phenyl-3-methylpyrazol-5-one; HNAPMP
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