A compound, represented by formula (I):
wherein A, B, R
1
, R
2
, R
3
, R
5
, R
6
, R
7
, R
9
, and R
10
are as defined herein, or an enantiomer, diastereoisomer or tautomer thereof, including a salt, ester or derivative thereof, as an inhibitor of HCV NS5B polymerase.