.alpha.-Naphthylamine-4,8-disulfonic acid 1,5-Naphthalenedisulfonic acid, 4-amino- 1-Aminonaphthalene-4,8-disulfonic acid 1-Naphthylamine-4,8-disulfonic acid 1-Naphthylamine-4,8-disulphonic acid 117-55-5 4-Amino-1,5-naphthalenedisulfonic acid Amino-S acid NSC5526