2-Naphthalenesulfonic acid, 5-((4-(acetylamino)-2-sulfophenyl)azo)-6-amino-4-hydroxy-, disodium salt 61724-43-4 6360-07-2 80619-61-0 Disodium 5-((4-acetylamino-2-sulphophenyl)azo)-6-amino-4-hydroxynaphthalene-2-disulphonate EINECS 228-823-2