1,4-Oxy Acid 1-Hydroxy-4-naphthalenesulfonic acid 1-NAPHTHOL-4-SULFONIC ACID 1-Naphthalenesulfonic acid, 4-hydroxy- 1-Naphtho-4-sulfonic acid 37860-62-1 4-Hydroxy-1-naphthalenesulfonic acid 4-Hydroxynaphthalene-1-sulphonic acid 6099-57-6 84-87-7 EINECS 201-568-4 NSC 9587 NW Acid Nevile and Winther's acid Neville-winther acid alpha-Naphthol-4-sulfonic acid