Patent ID: 7183268

Claim:
A compound having the formula: wherein B is 2-aminopurine-9-yl, which is unsubstituted or substituted at the 6 position with NHR 1 , OR 2 , or SR 3 ; R 1 , is selected from the group consisting of alkenyl, alkynyl, and benzyl, any of which may be optionally substituted with one or more members of the group consisting of hydroxy, halo, amino, acyl, cycloalkyl, heterocyclyl and aryl; R 2 is selected from the group consisting of alkenyl, alkynyl, and cycloalkyl, any of which may be branched or unbranched and optionally substituted with one or more members of the group consisting of hydroxy, halo, amino, acyl, cycloalkyl, heterocyclyl, and aryl; and R 3 is selected from the group consisting of alkyl, alkenyl, alkynyl, and cycloalkyl, any of which may be branched or unbranched and optionally substituted with one or more members of the group consisting of hydroxy, halo, amino, acyl, cycloalkyl, heterocyclyl and aryl.