novel bispidin derivatives for the treatment of cardiac arrhythmias, which are

摘要

There is provided compounds of formula I,wherein R1, R2, R3, R4, R5a, R5b, R6, R9, X, 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.