2-Naphthalenesulfonic acid, 8-((4-(ethyl((3-sulfophenyl)methyl)amino)phenyl)azo)-5-(phenylazo)-, disodium salt 62133-80-6 Disodium 8-((4-(ethyl((3-sulphonatophenyl)methyl)amino)phenyl)azo)-5-(phenylazo)naphthalene-2-sulphonate EINECS 263-426-8