The present invention provides a compound of formula (I)
or its salts or pharmaceutically acceptable derivatives wherein R
1
, R
2
, R
3
, X
1
, and A are defined herein. The compounds are useful as potassium ion channel inhibitors.
本发明提供公式(I)化合物或其盐或药学上可接受的衍
生物,其中R1、R2、R3、X1和A的定义如本文所述。该化合物可作为
钾离子通道
抑制剂。