| 摘要 |
Compounds of the general formula: <IMAGE> wherein: the ring A is saturated and n=0 or 1, or the ring A is a benzene ring and n=1, R1 represents a lower alkyl group which can carry an amino group, R2 represents a hydrogen atom or a lower alkyl group, R3 represents a straight or branched alkyl group, a mono- or di-cycloalkylalkyl or phenylalkyl group having no more than a total of 9 carbon atoms, or a substituted alkyl group, and also the salts thereof. These compounds are useful as therapeutic drugs.
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