1,4-Benzenedisulfonic acid, 2-((4-((4-amino-1-naphthalenyl)azo)-6-sulfo-1-naphthalenyl)azo)-, trisodium salt 64346-74-3 EINECS 264-815-5 Trisodium 2-((4-((4-amino-1-naphthyl)azo)-6-sulphonato-1-naphthyl)azo)benzene-1,4-disulphonate