1,3-Naphthalenedisulfonic acid, 7-((4-((2-methyl-4-((4-nitrobenzoyl)amino)phenyl)azo)phenyl)azo)-, disodium salt 68084-11-7 7-((4-((4-(4-Nitrobenzoylamino)-2-methylphenyl)azo)phenyl)azo)-1,3-naphthalenedisulfonic acid, disodium salt Disodium 7-((4-((2-methyl-4-((4-nitrobenzoyl)amino)phenyl)azo)phenyl)azo)naphthalene-1,3-disulphonate EINECS 268-423-5