(R)-2-[(S)-2-((2S,3S)-2-Acetylamino-3-methyl-pentanoylamino)-3-phenyl-propanoylamino]-3-mercapto-propionic acid AIDS-106179 AIDS106179 AcIle-Cha(beta-cyclohexylalanine)-Cys Product-based HCV NS3 protease inhibitor