1,7-Naphthalenedisulfonic acid, 4-(benzoylamino)-6-((4-((ethyl-1-naphthalenylamino)carbonyl)phenyl)azo)-5-hydroxy-, disodium salt 6417-36-3 Disodium 4-(benzoylamino)-6-((4-((ethyl-1-naphthylamino)carbonyl)phenyl)azo)-5-hydroxynaphthalene-1,7-disulphonate EINECS 229-136-0