1-Phenol-4-sulfonamide,2-(3-methyl-5-oxo-1-phenyl-2-pyrazolin-4-ylazo)- (6CI); 1-Phenol-4-sulfonamide,2-(5-hydroxy-3-methyl-1-phenyl-4-pyrazolylazo)- (5CI); Benzenesulfonamide,3-[(4,5-dihydro-3-methyl-5-oxo-1-phenyl-1H-pyrazol-4-yl)azo]-4-hydroxy- (9CI);Benzenesulfonamide, 4-hydroxy-3-[(3-methyl-5-oxo-1-phenyl-2-pyrazolin-4-yl)azo]-(7CI,8CI)
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