Compounds of formula (I): wherein R1 is hydroxyl or NHSO2R1A, wherein R1A is (C1-8) alkyl, (C3-7) cycloalkyl or {(C1-6) alkyl-(C3-7) cycloalkyl }, all of which are optionally substituted 1 to 3 times with halogen, cyano, nitro, O(C1-6) alkyl, amido, amino or phenyl, or R1A is C6 or C10 aryl, depending on Requires 1 to 3 substitutions with halogen, cyano, nitro, (C1-6) alkyl, O(C1-6) alkyl, amido, amino or phenyl; R2 is (C5-6) ring Alkyl and R3 are cyclopentyl; or a pharmaceutically acceptable salt thereof, useful as an HCV NS3 protease inhibitor.