1,3-Naphthalenedisulfonic acid, 4-amino-5-hydroxy- 4-Amino-5-hydroxy-1,3-naphthalenedisulfonic acid 4-Amino-5-hydroxynaphthalene-1,3-disulphonic acid 8-Amino-1-naphthol-5,7-disulfonic acid 82-47-3 Chicago acid EINECS 201-425-6 NSC 7111 SS Acid