1-Hydroxy-3,6-naphthalenedisulfonic acid 1-Naphthol, 3,6-disulfo- 1-Naphthol-3,6-disulfonic acid 2,7-Naphthalenedisulfonic acid, 4-hydroxy- 4-Hydroxynaphthalene-2,7-disulphonic acid 578-85-8 EINECS 209-432-6 NSC 8627