2,7-Naphthalenedisulfonic acid, 3-amino- 2-Amino-3,6-disulfonaphthalene 2-Aminonaphthalene-3,6-disulfonic acid 2-Naphthylamine-3,6-disulfonic acid 3-Amino-2,7-naphthalenedisulfonic acid 3-Aminonaphthalene-2,7-disulphonic acid 92-28-4 Amido-R-acid Amino-R acid Amino-R-acid EINECS 202-143-6 NSC 5525