| abstract |
(57) [Summary] [Structure] General formula (1) (In the formula, R 1 represents a lower alkyl group having 1 to 6 carbon atoms, Represents an ethylene group, a propylene group, a butylene group or a butenylene group)). [Effect] It is useful as an intermediate for the production of a compound represented by the general formula (5), which is an extremely useful therapeutic agent for peptic ulcer. |