| 摘要 |
The invention provides compounds of general formula I <IMAGE> I and pharmaceutically acceptable acid addition and quaternary ammonium salts thereof, wherein R represents hydrogen or lower alkyl, R1 represents hydrogen or lower alkyl, R2 represents hydrogen or lower alkyl, R3 represents hydrogen, halogen, lower alkoxy, hydroxy, or lower alkyl, R4 represents hydrogen, lower alkyl, cycloalkyl of 5 to 7 carbon atoms, thienyl, furyl, phenyl; phenyl mono- or disubstituted by halogen, lower alkyl, lower alkoxy, hydroxy or trifluoromethyl; or benzoyl, halobenzoyl, lower alkanoyl, cycloalkanoyl of 6 to 8 carbon atoms, or thienoyl, A represents an alkylene, mono- or diketo- or hydroxy-alkylene radical having from 1 to 5 carbon atoms and X is oxygen or sulphur.
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