Compounds having the structure ##SPC1## Wherein R.sup.1 is hydrogen, alkyl, aryl, halo, alkoxy or aryloxy; R.sup.2 is hydrogen or methyl; R.sup.3 is alkyl, haloalkyl, cycloalkyl or aryl; X is oxygen or sulfur; and Y is oxygen, sulfur or =NH, have useful physiological activity.
具有结构##
SPC1##的化合物,其中R.sup.1为氢,烷基,芳基,卤素,烷氧基或芳氧基;R.sup.2为氢或甲基;R.sup.3为烷基,卤代烷基,环烷基或芳基;X为氧或
硫;Y为氧,
硫或=NH,具有有用的生理活性。