2-Naphthalenesulfonic acid, 8-amino-4-hydroxy-3-((4-((4-sulfophenyl)azo)phenyl)azo)-, disodium salt 68227-73-6 Disodium 8-amino-4-hydroxy-3-((4-((4-sulphonatophenyl)azo)phenyl)azo)naphthalene-2-sulphonate EINECS 269-385-2