2-Naphthalenesulfonic acid, 5-((4-ethoxyphenyl)azo)-8-((4-sulfophenyl)azo)-, disodium salt 36409-70-8 Disodium 5-((4-ethoxyphenyl)azo)-8-((4-sulphonatophenyl)azo)naphthalene-2-sulphonate EINECS 253-020-9