Patent ID: 7157441

Claim:
A method for the treatment of a hepatitis C virus infection in a host, comprising administering an anti-virally effective amount of a compound of Formula XVII: or a pharmaceutically acceptable salt or ester thereof, wherein: Base is a purine; R 1 and R 2 are independently H; phosphate; a stabilized phosphate prodrug; acyl; or pharmaceutically acceptable leaving group which when administered in vivo is capable of providing a compound wherein R 1 and R 2 are independently H or phosphate; R 6 is, alkyl, R 7 and R 9 are independently hydrogen, OR 2 , hydroxy, alkyl, azido, cyano, alkenyl, alkynyl, Br-vinyl, —C(O)O(alkyl), —C(O)O(lower alkyl), —O(acyl), —O(lower acyl), —O(alkyl), —O(lower alkyl), —O(alkenyl), chlorine, bromine, iodine, NO 2 , NH 2 , —NH(lower alkyl), —NH(acyl), —N(lower alkyl) 2 , or —N(acyl) 2 ; R 10 is H, alkyl, chlorine, bromine or iodine; alternatively, R 7 and R 9 , or R 7 and R 10 can come together to form a bond; and X is O.