2,7-Naphthalenedisulfonic acid, 5-amino-3-((4-((4-((2-amino-8-hydroxy-6-sulfo-1-naphthalenyl)azo)benzoyl)amino)phenyl)azo)-4-hydroxy-, trisodium salt 85721-13-7 EINECS 288-423-9 Trisodium 5-amino-3-((4-((4-((2-amino-8-hydroxy-6-sulphonato-1-naphthyl)azo)benzoyl)amino)phenyl)azo)-4-hydroxynaphthalene-2,7-disulphonate