Compounds of formula (I), or salts thereof: ##STR1## wherein: X is oxygen or sulphur, or >C.dbd.X represents ##STR2## Y is --CH.sub.2 --CH.sub.2 -- or --CH.dbd.CH--; n is 1 to 5; R.sub.1 is hydrogen or C.sub.1-6 alkyl; R.sub.2 is hydrogen or C.sub.1-4 alkyl; and R.sub.3 is C.sub.4-9 alkyl, C.sub.5-8 cycloalkyl, or C.sub.5-8 cycloalkyl --C.sub.1-6 alkyl; or R.sub.2 and R.sub.3 taken with the carbon atom to which they are joined represent a C.sub.5-8 cycloalkyl group, having useful pharmacological activity, pharmaceutical compositions containing them and a process for their preparation.
化合物式(I)或其盐:##STR1##
其中:X为氧或
硫,或>C.dbd.X代表##STR2##
Y为--CH.sub.2--CH.sub.2--或--CH.dbd.CH--;
n为1至5;
R.sub.1为氢或C.sub.1-6烷基;
R.sub.2为氢或C.sub.1-4烷基;
R.sub.3为C.sub.4-9烷基、C.sub.5-8环烷基或C.sub.5-8环烷基--C.sub.1-6烷基;或R.sub.2和R.sub.3与它们连接的碳原子一起表示C.sub.5-8环烷基,具有有用的药理活性,制备它们的制药组合物和方法。