Compounds of formula (I) and pharmaceutically acceptable salts thereof: ##STR1## wherein a, b, J, Y and R.sub.2 -R.sub.8 are as defined herein are potassium channel activators, a process for their preparation and their pharmaceutical use.
化合物I的公式及其药学上可接受的盐:其中a,b,J,Y和R2-R8的定义如本文所述,是
钾通道激活剂,其制备方法及其药学用途。