| abstract |
(57) [Summary] [PROBLEMS] To provide a novel piperidine derivative, a derivative thereof and a pharmacologically acceptable salt thereof, which are useful as a therapeutic / preventive agent for arrhythmia. [Structure] A compound represented by the formula (I) or a pharmacologically acceptable salt thereof, and an arrhythmia treatment / prevention agent containing the compound as an active ingredient. [Chemical 1] (Wherein R 1 is a lower alkyl group or a tolyl group, R 2 is a hydrogen atom, a lower alkyl group, etc., R 3 is a hydrogen atom, a lower alkyl group, etc., X is a formula —CO—, —CH 2 —, etc., g Is 1 or 2, h is 2 or 3, Y is a hydrogen atom, a lower alkyl group, -AB [A is-(CH 2 ). n- (n is 1 to 5), etc., B is |