Hepatitis C virus inhibitors

A compound of Formula (II)

• or a pharmaceutically acceptable salt thereof, wherein
• D and E are each five-membered aromatic rings containing one, two, or three heteroatoms independently selected from nitrogen, oxygen, and sulfur;
• provided that at least one of D and E is other than imidazole;
• R3 and R4 are independently selected from hydrogen and R3—C(O)—;
• and
• each R3 is independently selected from alkoxy, alkoxyalkyl, alkoxycarbonyl, alkoxycarbonylalkyl, alkyl, alkylcarbonylalkyl, aryl, arylalkenyl, arylalkoxy, arylalkyl, aryloxyalkyl, cycloalkyl, (cycloalkyl)alkenyl, (cycloalkyl)alkyl, cycloalkyloxyalkyl, haloalkyl, heterocyclyl, heterocyclylalkenyl, heterocyclylalkoxy, heterocyclylalkyl, heterocyclyloxyalkyl, hydroxyalkyl, —NRcRd, (NRcRd)alkenyl, (NRcRd)alkyl, and (NRcRd)carbonyl.

A compound of Formula (III)

• or a pharmaceutically acceptable salt thereof, wherein
• D and E are each five-membered aromatic rings containing one, two, or three heteroatoms independently selected from nitrogen, oxygen, and sulfur;
• provided that at least one of D and E is other than imidazole;
• and provided that both D and E are each substituted through carbon atoms;
• R1 and R2 are independently selected from hydrogen and R3—C(O)—;
• and
• each R3 is independently selected from alkoxy, alkoxyalkyl, alkoxycarbonyl, alkoxycarbonylalkyl, alkyl, alkylcarbonylalkyl, aryl, arylalkenyl, arylalkoxy, arylalkyl, aryloxyalkyl, cycloalkyl, (cycloalkyl)alkenyl, (cycloalkyl)alkyl, cycloalkyloxyalkyl, haloalkyl, heterocyclyl, heterocyclylalkenyl, heterocyclylalkoxy, heterocyclylalkyl, heterocyclyloxyalkyl, hydroxyalkyl, —NRcRd, (NRcRd)alkenyl, (NRcRd)alkyl, and (NRcRd)carbonyl.