1,3-Naphthalenedisulfonic acid, 7-((4-((4-((4-(benzoylamino)benzoyl)amino)-2-methylphenyl)azo)phenyl)azo)-, disodium salt 79770-26-6 Disodium 7-((4-((4-((4-(benzoylamino)benzoyl)amino)-o-tolyl)azo)phenyl)azo)naphthalene-1,3-disulphonate EINECS 279-254-1