The present invention is directed to aminomethyl compounds which are inhibitors of the beta-secretase enzyme and that are useful in the treatment of diseases in which the beta-secretase enzyme is involved, such as Alzheimer’s disease. Cover material overlies the forward major surface to reduce the visibility of seams between adjacent substrate segments. To this end, the edge of the recess is rounded off in the area of the valve recesses in a special machining phase, the cutting edges of the cutting tool being guided in one or more planes that are parallel to the inclined valve recess surface.