1-Naphthalenesulfonic acid, 2-hydroxy-, monosodium salt 2-Hydroxy-1-naphthalenesulfonic acid monosodium salt 2-Naphthol-1-sodium sulfonate 25059-14-7 79013-23-3 Armstrong acid EINECS 246-586-3 NSC 37037 Sodium 2-hydroxynaphthalene-1-sulphonate Sodium beta-naphthol-1-sulfonate