A conveyor for conveying products, comprising a conveyor belt and a moving endless guiding element which includes a straight portion extending between two guide wheels, which straight portion is capable of guiding products that are present on the conveyor belt in lateral direction towards and over the edge of the conveyor belt, wherein the distance between the two guide wheels is adjustable. The direction of the line segment may be determined, and using the direction certain pixels in a four-pixel grouping may be selectively illuminated. The shutter locks are biased toward a first position. The step forming portion has a difference in level such that the extending portion is situated inside the base plate mounting portion with respect to its thickness direction. The electrode portion of each of the electrode connecting portions is connected to the external circuit. In another embodiment, the invention discloses pharmaceutical compositions comprising such compounds as well as methods of using them to treat disorders associated with the HCV protease.