2,7-Naphthalenedisulfonic acid, 5-(acetylamino)-3-((4-((3,5-dimethyl-4-((8-sulfo-2-naphthalenyl)azo)phenyl)azo)-2-ethoxy-6-sulfo-1-naphthalenyl)azo)-4-hydroxy-, tetrasodium salt 6428-18-8 EINECS 229-203-4 Tetrasodium 5-(acetylamino)-3-((4-((3,5-dimethyl-4-((8-sulphonato-2-naphthyl)azo)phenyl)azo)-2-ethoxy-6-sulphonato-1-naphthyl)azo)-4-hydroxynaphthalene-2,7-disulphonate