2,7-Naphthalenedisulfonic acid, 5-amino-3-((4-((4-((8-amino-1-hydroxy-3,6-disulfo-2-naphthalenyl)azo)-3-methoxyphenyl)azo)phenyl)azo)-4-hydroxy-, tetrasodium salt 72017-91-5 EINECS 276-293-6 Tetrasodium 5-amino-3-((4-((4-((8-amino-1-hydroxy-3,6-disulphonato-2-naphthyl)azo)-3-methoxyphenyl)azo)phenyl)azo)-4-hydroxynaphthalene-2,7-disulphonate