Compounds having the formula
and pharmaceutically acceptable salts thereof wherein X is alkyl, Y is a single bond, -CH₂-, -C(O)-, -O-, -S- or -N(R⁸)- where R⁸ is hydrogen, alkyl, haloalkyl, aryl, arylalkyl, cycloalkyl or (cycloalkyl)alkyl, and R¹ to R⁷ are as defined herein. These compounds have potassium channel activating activity and are useful, therefore for example, as cardiovascular agents.
Compounds having the formula ##STR1## and pharmaceutically acceptable salts thereof wherein X is alkyl, Y is a single bond, --CH.sub.2 --, --C(O)--, --O--, --S-- or --N(R.sup.8)-- where R.sup.8 is hydrogen, alkyl, haloalkyl, aryl, arylalkyl, cycloalkyl or (cycloalkyl)alkyl, and R.sup.1 to R.sup.7 are as defined herein. These compounds have potassium channel activating activity and are useful, therefore for example, as cardiovascular agents.