2,7-NAPHTHALENEDISULFONIC ACID, 4-AMINO-5-HYDROXY-, DISODIUM SALT 3963-80-2 Disodium 4-amino-5-hydroxy-2,7-naphthalenedisulfonate Disodium 4-amino-5-hydroxynaphthalene-2,7-disulphonate EINECS 223-566-2 H Acid disodium salt