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