2-Naphthalenesulfonic acid, 8-((4-hydroxyphenyl)azo)-5-((4-((4-nitro-2-sulfophenyl)amino)phenyl)azo)-, disodium salt 85283-57-4 Disodium 8-((4-hydroxyphenyl)azo)-5-((4-((4-nitro-2-sulphonatophenyl)amino)phenyl)azo)naphthalenesulphonate EINECS 286-586-0