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Compounds of formula (I), wherein R1 is hydroxyl or NHSO2R1A wherein R1A is (C1-8)alkyl, (C3-7)cyclically or {(C1.6)alkyl-(C3.7)cyclically}, which are all optionally substituted from 1 to 3 times with halo, cyanic, nitro, O(C1-6)alkyl, amide, amino or phenyl, or R1A is C6 or C10 aryl which is optionally substituted from 1 to 3 times with halo, Cano, nitro, (C1.6)alky], O(C1-.6)alkyl, amigo, amino or phenyl; R2 is (C5-6)cyclically and R3 is cyclopentyl; or a pharmaceutically acceptable salt thereof, useful as inhibitors of the HCV NS3 protease.