2,7-Naphthalenedisulfonic acid, 3-amino-5-hydroxy- 2R Acid 3-Amino-5-hydroxynaphthalene-2,7-disulphonic acid 7-Amino-1-hydroxy-3,6-naphthalenedisulfonic acid 7-Amino-1-naphthol-3,6-disulfonic acid 90-40-4 EINECS 201-989-3 Gamma disulfo acid NSC 10435 RR Acid