| 摘要 |
This invention relates to compounds having the formula: <IMAGE> (I) and acid addition and quaternary ammonium salts thereof, wherein R represents hydrogen or lower alkyl, R1 represents hydrogen, lower alkyl, cycloalkyl of 5 to 7 carbon atoms, substituted or unsubstituted aralkyl of 7 to 12 carbon atoms, substituted or unsubstituted aryl (including heterocyclic aryl), or substituted or unsubstituted aroyl, Ar represents a substituted or unsubstituted phenyl radical and X represents oxygen or sulphur, which exhibit action on the cardiovascular system.
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