Abstract: Cyclohexenone esters of the general formula I ##STR1## or pharmaceutically acceptable acid addition salts thereof, wherein, X is oxygen or sulphur,R.sub.1 is1. alkyl,2. cycloalkyl,3. alkenyl,4. alkynyl,5. aralkyl,6. aryl,7. pyridyl,8. ##STR2## or 9. - (CH.sub.2).sub.m Y in which Y is perhalogenoalkyl, hydroxy, hydroxyalkoxy, hydroxyalkoxyalkoxy, alkoxy, alkoxyalkoxy, acyloxy or alkoxycarbonyl, or Y is -S(CH.sub.2).sub.n OZ, in which Z is acyl, m and n each represent integers of 1 to 3R.sub.2 is1. hydrogen,2. alkyl, optionally substituted by alkoxy or alkoxycarbonyl,3. alkoxycarbonyl,4. cycloalkyl,5. cycloalkenyl,6. aryl, aralkyl, or aralkenyl in which the aryl portion may be substituted by alkyl, alkoxy, alkoxyalkyl, methylenedioxy, alkoxycarbonyl, perhalogenoalkyl, nitro, halogen, nitrile, aryl, dialkylaminocarbonyl, amino, alkylamino, dialkyamino or aralkoxy,7. a saturated or unsaturated heterocyclic ring containing one or more heteroatoms and which ring may be substituted by alkyl,8. ##STR3## OR 9.