2-Naphthalenesulfonyl chloride 2-Naphthylsulfonyl chloride 93-11-8 EINECS 202-219-9 NAPHTHALENE-2-SULPHONYL CHLORIDE NSC 133893 Naphthalene-2-sulfonic acid chloride Naphthalene-2-sulfonyl chloride beta-Naphthalenesulfochloride beta-Naphthalenesulfonyl chloride