| 摘要 |
Compounds of formula (I), or salts thereof: <IMAGE> (I) wherein: X is oxygen or sulphur, or >C=X represents <IMAGE> Y is -CH2-CH2- or -CH=CH-; n is 1 to 5; R1 is hydrogen or C1-6 alkyl; R2 is hydrogen or C1-4 alkyl; and R3 is C4-9 alkyl, C5-8 cycloalkyl, or C5-8 cycloalkyl -C1-6 alkyl; or R2 and R3 taken with the carbon atom to which they are joined represent a C5-8 cycloalkyl group, having useful pharmacological activity, pharmaceutical compositions containing them and a process for their preparation. |
