2,7-Naphthalenedisulfonic acid, 3-((2,4-bis(2-methylphenoxy)phenyl)azo)-4-hydroxy-5-(((4-methylphenyl)sulfonyl)amino)-, disodium salt 70210-05-8 Disodium 3-((2,4-bis(2-methylphenoxy)phenyl)azo)-4-hydroxy-5-(((p-tolyl)sulphonyl)amino)naphthalene-2,7-disulphonate EINECS 274-402-1