Compounds having the formula ##STR1## and pharmaceutically acceptable salts thereof wherein X is a single bond, O, CO, S, NH or N(lower alkyl); Y is O, S or NCN; and R.sup.1 to R.sup.5' are as defined herein. These compounds have potassium channel activating activity and are useful, therefore for example, as cardiovascular agents.
具有如下公式##STR1##及其药用盐的化合物,其中X是单键,O,CO,S,NH或N(较低烷基);Y是O,S或NCN;R.sup.1到R.sup.5'如本文所定义。这些化合物具有
钾通道激活活性,因此例如作为心血管药物而有用。