Abstract:
Provided are fused tricyclic compounds effective to inhibit the function of the NS5A protein of formula (I), wherein X, X′, Y, Y′, A, A′, Q1, Q2, R1-R4, X4, R5a, f and W are defined as in the description. Also provided herein are pharmaceutical compositions thereof, and uses in the manufacture of a medicament for treating HCV infection or a HCV disorder thereof.