1-NAPHTHALENESULFONIC ACID, 2-HYDROXY- 2-Hydroxy-1-naphthalenesulfonic acid 4-11-00-00621 (Beilstein Handbook Reference) 567-47-5 BRN 2214795 Kyselina 2-naftol-1-sulfonova [Czech] Oxy-Tobias acid Stebbins acid beta-Naphtholsulfonic acid