2,7-Naphthalenedisulfonic acid, 4-amino-5-hydroxy-6-((2-methoxy-5-methyl-4-((8-((phenylsulfonyl)oxy)-3,6-disulfo-1-naphthalenyl)azo)phenyl)azo)-, tetrasodium salt 67939-43-9 EINECS 267-837-3 Tetrasodium 4-amino-5-hydroxy-6-((2-methoxy-5-methyl-4-((8-((phenylsulphonyl)oxy)-3,6-disulphonato-1-naphthyl)azo)phenyl)azo)naphthalene-2,7-disulphonate