Patent ID: 7064217

Claim:
A compound represented by the formula: R 11 is selected from the group consisting of H, hydroxy, NH 2 , C 1 –C 18 alkyl, C 1 –C 18 alkenyl, C 1 –C 18 alkynyl and —(CH 2 ) n —Z—R 6 ; R 4 is selected from the group consisting of hydroxy, phosphate, phosphonate, methylene phosphonate, α-substituted methylene phosphonate, phosphate analogs and phosphonate analogs; y is an integer ranging from 1 to 4; m is an integer ranging from 0 to 4; n is an integer ranging from 0 to 10; Z is selected from the group consisting of aryl and heteroaryl; R 6 is selected from the group consisting of H, C 1 –C 10 alkyl, C 1 –C 20 alkoxy, C 1 –C 20 alkylthio, and C 1 –C 20 alkylamino; and R 7 and R 8 are independently selected from the group consisting of O, S and N; or a pharmaceutically acceptable salt thereof.