13390-46-0 2,7-Naphthalenedisulfonic acid, 3-((4-(acetylamino)phenyl)azo)-4-hydroxy-5-((phenylsulfonyl)amino)-, disodium salt Disodium 3-((4-(acetylamino)phenyl)azo)-4-hydroxy-5-((phenylsulphonyl)amino)naphthalene-2,7-disulphonate EINECS 236-464-8