2-Naphthalenesulfonic acid, 5-((4-hydroxyphenyl)azo)-8-((4-((4-nitro-2-sulfophenyl)amino)phenyl)azo)-, disodium salt 85283-58-5 Disodium 5-((4-hydroxyphenyl)azo)-8-((4-((4-nitro-2-sulphonatophenyl)amino)phenyl)azo)naphthalene-2-sulphonate EINECS 286-587-6