Discovery of MK-5172, a Macrocyclic Hepatitis C Virus NS3/4a Protease Inhibitor. - Harper S; McCauley JA; Rudd MT; Ferrara M; DiFilippo M; Crescenzi B; Koch U; Petrocchi A; Holloway MK; Butcher JW; Romano JJ; Bush KJ; et al. (ACS medicinal chemistry letters, 2012)