1-Amino-2-naphthol-3,6-disulphonic acid sodium salt 2,7-Naphthalenedisulfonic acid, 4-amino-3-hydroxy- 2007-20-7 3,6-NAPHTHALENEDISULFONIC ACID, 8-AMINO-7-HYDROXY-, SODIUM SALT 3,6-Naphthalenedisulfonic acid, 1-amino-2-hydroxy-, disodium salt 4-Amino-3-hydroxy-2,7-naphthalenedisulfonic acid R-Amine salt Sodium salt of 1-amino-2-naphthol-3,6-disulphonic acid