.beta.-Naphthol-6-sulfonic acid .beta.-Naphtholsulfonic acid S 2-Hydroxy-6-naphthalenesulfonic acid 2-Hydroxynaphthalene-6-sulfonic acid 2-Naphthalenesulfonic acid, 6-hydroxy- 2-Naphthol-6-sulfonic acid 2-Naphtol-6-sulfosaure 6-Hydroxy-2-naphthalenesulfonic acid 93-01-6 NSC5871 Schaeffer's .beta.-acid Schaeffer's .beta.-naphtholsulfonic acid Schaeffer's acid WLN: L66J CSWQ HQ