2,7-Naphthalenedisulfonic acid, 5-amino-4-hydroxy-3-((1-sulfo-2-naphthalenyl)azo)-, trisodium salt 5045-23-8 EINECS 225-742-4 Trisodium 5-amino-4-hydroxy-3-((1-sulphonato-2-naphthyl)azo)naphthalene-2,7-disulphonate