Anti-viral compounds

A compound represented by the formula

• wherein a dashed line indicates the presence or absence of a bond;
• R1 is Ra, OR2 or NR2R3;
• each Ra is independently H, optionally substituted hydrocarbyl, optionally substituted aryl, optionally substituted heteroaryl;
• R2 and R3 are each independently Ra, CORa, or SO2Ra;
• Y1, Y2, Y3 and Y4 are each independently CR4 or N;
• each R4 is independently R2, ORa, NR2R3, SRa, SORa, SO2Ra, SO2NHRa, NCORa, halogen, trihalomethyl, CN, S═O, or nitro;
• R5 is Ra, CORa, SO2Ra, or is not present;
• V is CR2, CR2R3, C═O, COCR2R3, or C═NR2;
• and,
• W and X are each independently N, NRa, O, S, CR2R4 or CR4.