Patent ID: 7384935

Claim:
A compound of Formula I or a pharmaceutically acceptable salt thereof: wherein, R 1 R 2 and R 3 are each independently selected from the group consisting of H and a phosphate of formula II: wherein at least one of R 1, R 2, or R 3 is a phosphate of formula II; R 4 and R 5 are each independently selected from the group consisting of H, C 1-10 alkyl, C 2-10 alkenyl, C 2-10 alkynyl, C 6-10 aryl, a 5-10 member heteroaryl, C 3-10 cycloalkyl, and a 3-10 member heterocycloalkyl; wherein, when either or both of R 4 and R 5 comprises an alkyl, alkenyl, alkynyl, aryl, heteroaryl, cycloalkyl, or heterocycloalkyl group, then said alkyl, alkenyl, alkynyl, aryl, heteroaryl, cycloalkyl, or heterocycloalkyl group is optionally substituted with one or more substituents selected from the group consisting of acyl, amino, acylamino, acyloxy, carboalkoxy, carboxy, carboxyamido, cyano, halo, hydroxyl, nitro, thiol, C 1-6 alkyl, C 2-7 alkenyl, C 2-7 alkynyl, C 3-10 cycloalkyl, a 3-10 member heterocycloalkyl, C 6-10 aryl, a 5-10 member heteroaryl, alkoxy, aryloxy, sulfinyl, sulfonyl, oxo, guanidino and formyl.