2,7-Naphthalenedisulfonic acid, 3-((3,3'-dimethyl-4'-((4-(((4-methylphenyl)sulfonyl)oxy)phenyl)azo)(1,1'-biphenyl)-4-yl)azo)-4-hydroxy-5-(((4-methylphenyl)sulfonyl)oxy)-, disodium salt 68345-21-1 Disodium 3-((3,3'-dimethyl-4'-((4-(((p-tolyl)sulphonyl)oxy)phenyl)azo)(1,1'-biphenyl)-4-yl)azo)-4-hydroxy-5-(((p-tolyl)sulphonyl)oxy)naphthalene-2,7-disulphonate EINECS 269-849-4