135-76-2 15883-56-4 2-Hydroxy-6-naphthalenesulfonic acid 2-Naphthalenesulfonic acid, 6-hydroxy- 2-Naphthol-6-sulfonic acid 2-Naphtol-6-sulfosaure [German] 4-11-00-00622 (Beilstein Handbook Reference) 6-HYDROXY-2-NAPHTHALENESULFONIC ACID 6-Hydroxynaphthalene-2-sulphonic acid 61886-35-9 833-66-9 93-01-6 BRN 0521151 EINECS 202-209-4 Kyselina 2-naftol-6-sulfonova [Czech] Kyselina schaferova [Czech] NSC 5871 Schaeffer's acid Schaeffer's beta-naphtholsulfonic acid beta-Naphthol-6-sulfonic acid beta-Naphtholsulfonic acid S