The invention relates to 2-(Butyl-l-sulfonylamino)-N-l (R)-(6-methoxy-pyridin-3-yl)-propyl-benzamid of formula (I), and to the pharmaceutically acceptable salts thereof. Said invention also relates to the production and use of the inventive compound or the pharmaceutically acceptable salts thereof, in particular for treating and preventing auricular arrhythmia, for example auricular fibrillation (atrial fibrillation) or auricular flutter (atrial flutter).