1-Phenol-4-sulfonamide,2-(2-hydroxy-1-naphthylazo)- (6CI); Benzenesulfonamide, 4-hydroxy-3-[(2-hydroxy-1-naphthalenyl)azo]-(9CI); Benzenesulfonamide, 4-hydroxy-3-[(2-hydroxy-1-naphthyl)azo]- (7CI,8CI)
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