A method of treating an Hepatitis C Virus infection in a patient, comprising providing a therapeutically effective amount, to a patient in need thereof, of a compound of Formula (I) or a pharmaceutically acceptable salt thereof, wherein: G1 is a group of the formula or where n is 0, 1, 2, 3, or 4 and Het is a 5- or 6-membered heteroaryl group containing 1 to 4 heteroatoms independently chosen from N, O, and S, which Het is optionally substituted.
