Patent ID: 8138337

Claim:
A compound of Formula (VI): wherein: R a is indazolyl or substituted indazolyl having one or more substituents independently selected from: C 1-6 alkyl, C 3-6 cycloalkyl, C 1-6 alkyloxyC 1 -6acyl, morphorlinylC 1-6 alkyl, amino, amidino, guanidino, hydrazino, C 1-4 alkylamino, C 1-4 dialkylamino, halogen, nitro, arylalkyl, aryl, heterocyclyl, acyl, phenylsulfonyl, cycloalkylalkyl, acyloxyalkyl, aminocarbonyl and C 1-4 alkylformamidyl; R b is phenyl; R c is allyl or propyl; and each of X 1 , X 2 and X 3 is independently hydrogen, hydroxyl, or phosphate or a salt thereof, as an isolated stereoisomer or a mixture of stereoisomers.