| abstract |
(57) [Summary] [Structure] Formula (I) [In the formula, n is 0, 1 or 2, R 1 is hydrogen, halogen, etc., R 2 is hydrogen, etc., R 3 is hydrogen, etc., and R 4 is optionally substituted C 1 -C 8 alkyl. Etc., R 5 is optionally substituted C 6 -C 10 aryl and the like. ] Cephalosporin sulfone or a salt acceptable as a pharmaceutical or veterinary drug. The compounds of formula I and their pharmaceutically and veterinary acceptable salts are effective as elastase inhibitors. |