摘要 |
There is provided compounds of formula (I) wherein R<SUP>1 </SUP>to R<SUP>4</SUP>, R<SUP>a </SUP>to R<SUP>f</SUP>, A and B have meanings given in the description, which are useful in the prophylaxis and in the treatment of arrhythmias, in particular atrial and ventricular arrhythmias. |