disodium 6-amino-5-[[4-[(3-chlorobenzoyl)amino]-2-sulphonatophenyl]azo]-4-hydroxynaphthalene-2-sulphonate

2-Naphthalenesulfonic acid, 6-amino-5-[[4-[(3-chlorobenzoyl) amino]-2-sulfophenyl]azo]-4-hydroxy-, disodium salt