134-34-9 16698-16-1 2,7-Naphthalenedisulfonic acid, 4-(acetylamino)-5-hydroxy-, disodium salt 2,7-Naphthalenedisulfonic acid, 4-acetamido-5-hydroxy-, disodium 21698-08-8 Disodium 4-(acetylamino)-5-hydroxynaphthalene-2,7-disulphonate EINECS 240-746-6 NSC 74489