申请人:Yamaguchi Tetsuo
                            
                            
                                公开号:US20100256108A1
                            
                            
                                公开(公告)日:2010-10-07
                            
                            A compound of the formula:
wherein ring X is benzene or pyridine; R
1
is substituted alkyl; R
2
is optionally substituted aryl or optionally substituted heterocyclic group; R
3
is hydrogen or alkyl; R
4
is hydrogen, halogen or alkyl; R
5
is hydrogen or alkyl; R
6
and R
7
are the same or different and each hydrogen or halogen, or a pharmaceutically acceptable salt thereof, which is useful as I
Kur
blocker effective for preventing or treating cardiac arrhythmia such as atrial fibrillation.