2-Naphthalenesulfonic acid, 5,5'-(carbonyldiimino)bis(8-((4-((4-sulfophenyl)azo)phenyl)azo)-, tetrasodium salt 5,5'-Ureylenebis(8-((4-((4-sulfophenyl)azo)phenyl)azo)-2-naphthalenesulfonic acid), tetrasodium salt 68460-08-2 EINECS 270-630-0 Tetrasodium 5,5'-(carbonyldiimino)bis(8-((4-((4-sulphonatophenyl)azo)phenyl)azo)naphthalene-2-sulphonate)