.beta.-Naphthalenesulfonic sodium salt 2-Naphthalenesulfonic acid, sodium salt 532-02-5 NSC7415 Sodium .beta.-naphthalenesulfonate Sodium 2-naphthalenesulfonate Sodium naphthalene-2-sulfonate Sodium naphthalene-2-sulphonate Sodium naphthalene-6-sulfonate Sodium salt of .beta.-naphthalenesulfonic acid Sodium-2-naphthalenesulfonate