trisodium 3-[(2,4-dimethylphenyl)azo]-4-hydroxy-7-[[[[5-hydroxy-7-sulphonato-6-[(6-sulphonato-2-naphthyl)azo]-2-naphthyl]amino]carbonyl]amino]naphthalene-2-sulphonate

3-[(2,4-Dimethylphenyl)azo]-4-hydroxy-7-[[[[5-hydroxy-7-sulfo-6-[(6-sulfo-2-naphthalenyl)azo]-2-naphthalenyl]amino]carbonyl]amino]-2-naphthalenesulfonic acid trisodium salt