1,3,4,5-Tetrahydro-3-(3-hydroxypropyl)-7,8-dimethoxy-2H-3-benzazepin-2-one is used as a reagent in the synthesis of Ivabradine (I940500, HCl); a selective bradycardic agent with direct effect on the pacemaker If current of the sinoatrial node. Also an antianginal.