Large conductance calcium-activated K channel opener

摘要

A large conductance calcium-activated K channel opener comprising as an active ingredient a nitrogen-containing 5-membered heterocyclic compound represented by the following formula (I): wherein X represents N-R4, O or S, R1 and R2 each independently represent hydrogen, halogen, carboxyl, amino, lower alkyl, lower alkoxycarbonyl, lower alkenyl, cyclo-lower alkyl, carbamoyl, aryl, heterocyclic or heterocyclic-substituted carbonyl group, R3 represents aryl, heterocyclic or lower alkyl group, and R4 represents hydrogen or lower alkyl group.