1-Phenol-4-sulfonicacid, 2-(3-methyl-5-oxo-1-phenyl-2-pyrazolin-4-ylazo)-6-nitro- (6CI);Benzenesulfonic acid,3-[(4,5-dihydro-3-methyl-5-oxo-1-phenyl-1H-pyrazol-4-yl)azo]-4-hydroxy-5-nitro-(9CI); Benzenesulfonic acid,4-hydroxy-3-[(3-methyl-5-oxo-1-phenyl-2-pyrazolin-4-yl)azo]-5-nitro- (8CI)
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