Oxabispidine compounds and novel use in treating cardiac arrhythmias

A compound which is N- (2- {7- [2- (4-cyano-2-fluoro-phenoxy) -ethyl] -9-oxa-3,7-diazabicyclo [3.3.1] non-3- yl} -ethyl) - 2,4-difluoro-benzenesulfonamide, ** ** Formula or a pharmaceutically acceptable salt thereof.