2-Naphthalenesulfonic acid, 6-hydroxy-5-((2-hydroxy-3-((2-hydroxy-1-naphthalenyl)azo)-5-sulfophenyl)azo)-, disodium salt 3258-74-0 Disodium 6-hydroxy-5-((2-hydroxy-3-((2-hydroxynaphthyl)azo)-5-sulphonatophenyl)azo)naphthalene-2-sulphonate EINECS 221-858-4