.alpha.-Naphthol-8-sulfonic acid 1-Hydroxynaphthalene-8-sulfonic acid 1-Naphthalenesulfonic acid, 8-hydroxy- 1-Naphthol-8-sulfonic acid 1-Naphthol-8-sulphonic acid 117-22-6 NSC8626 Naphtholmonosulfonic acid S