(1,1'-Biphenyl)-2,2'-disulfonic acid, 4-((1-hydroxy-4-sulfo-2-naphthalenyl)azo)-5,5'-dimethyl-4'-((4-(((4-methylphenyl)sulfonyl)oxy)phenyl)azo)-, trisodium salt 6598-62-5 EINECS 229-538-6 Trisodium 4-((1-hydroxy-4-sulphonato-2-naphthyl)azo)-5,5'-dimethyl-4'-((4-(((4-methylphenyl)sulphonyl)oxy)phenyl)azo)(1,1'-biphenyl)-2,2'-disulphonate