2,7-Naphthalenedisulfonic acid, 5-amino-3-((4-((4-((6-amino-1-hydroxy-3-sulfo-2-naphthalenyl)azo)phenyl)azo)phenyl)azo)-4-hydroxy-, trisodium salt 52469-76-8 EINECS 257-939-6 Trisodium 5-amino-3-((4-((4-((6-amino-1-hydroxy-3-sulphonato-2-naphthyl)azo)phenyl)azo)phenyl)azo)-4-hydroxynaphthalene-2,7-disulphonate