摘要 |
There is provided compounds of formula (I), wherein R<SUP>1</SUP>, R<SUP>2 </SUP>and R<SUP>a </SUP>to R<SUP>b </SUP>have meanings given in the description, which are useful in the prophylaxis and in the treatment of arrhythmias, in particular atrial and ventricular arrhythmias. |