2-Naphthalenesulfonic acid, sodium salt 532-02-5 EINECS 208-523-8 NSC 7415 Sodium 2-naphthalenesulfonate Sodium beta-naphthalenesulfonate Sodium naphthalene-2-sulphonate Sodium naphthalene-6-sulfonate Sodium salt of beta-naphthalenesulfonic acid Sodium-2-naphthalenesulfonate beta-Naphthalenesulfonic sodium salt