Novel compounds of the formula ##STR1## and tautomers thereof, wherein at least one of R.sub.2, R.sub.3 and R.sub.4 is a strong electron withdrawing group, are disclosed. These compounds possess potassium channel activating activity and, as such, are useful as antihypertensive agents. Advantageously, the compounds of the present invention have shown less cardiac effects than known potassium channel activators. Also disclosed is a process for preparing these and other compounds.
公开了式子##STR1##及其互变异构体的新化合物,其中R.sub.2、R.sub.3和R.sub.4中至少有一个是强电子提取基团。这些化合物具有
钾通道激活活性,因此可用作降压剂。优点是,本发明的化合物显示出比已知的
钾通道激活剂更少的心脏作用。还公开了一种制备这些和其他化合物的方法。