1,3,5-Naphthalenetrisulfonic acid, 7-((4-((4-((sulfomethyl)amino)phenyl)azo)phenyl)azo)-, tetrasodium salt 68400-39-5 EINECS 270-028-8 Tetrasodium 7-((4-((4-((sulphonatomethyl)amino)phenyl)azo)phenyl)azo)naphthalene-1,3,5-trisulphonate