The present invention relates to a process for the preparation of macrocyclic compounds that are useful as hepatitis C virus protease inhibitor compounds. The zoom lens assembly includes a stationary lens group comprising a plurality of stationary lenses and a movable lens group comprising a plurality of movable lenses movable with respect to a sensor array of the imaging system. , a therapeutic agent-carrying stent or stent-graft, to a catheter without contacting an outer surface of the prosthesis, e.