7-[[[[6-[(o-anisyl)azo]-5-hydroxy-7-sulpho-2-naphthyl]amino]carbonyl]amino]-4-hydroxy-3-[(2-methyl-4-sulphophenyl)azo]naphthalene-2-sulphonic acid

4-Hydroxy-7-[[[[5-hydroxy-6-[(2-methoxyphenyl)azo]-7-sulfo-2-naphthalenyl]amino]carbonyl]amino]-3-[(2-methyl-4-sulfophenyl)azo]-2-naphthalenesulfonic acid