6-Amino-5-[[4-[[4-[[[(3,4-dichlorophenyl)amino]carbonyl]amino]benzoyl]amino]-2-sulfophenyl]azo]-4-hydroxy-2-naphthalenesulfonic acid

6-amino-5-[[4-[[4-[[[(3,4-dichlorophenyl)amino]carbonyl]amino]benzoyl]amino]-2-sulphophenyl]azo]-4-hydroxynaphthalene-2-sulphonic acid