2-Naphthalenesulfonic acid, 4-hydroxy-7-((1-oxodecyl)amino)-3-((2-sulfophenyl)azo)-, disodium salt 71873-40-0 Disodium 4-hydroxy-7-((1-oxodecyl)amino)-3-((2-sulphonatophenyl)azo)naphthalene-2-sulphonate EINECS 276-116-2