Patent ID: 8168617

Claim:
A compound of Formula (I): or a pharmaceutically acceptable salt thereof, wherein: Y is chosen from —O— and a bond; R 1 is chosen from C 1-6 alkyl, substituted C 1-6 alkyl, C 3-6 cycloalkyl, substituted C 3-6 cycloalkyl, phenyl, substituted phenyl, C 4-12 cycloalkylalkyl, substituted C 4-12 cycloalkylalkyl, C 7-12 arylalkyl, substituted C 7-12 arylalkyl, C 1-6 heteroalkyl, substituted C 1-6 heteroalkyl, C 3-6 heterocycloalkyl, substituted C 3-6 heterocycloalkyl, C 5-6 heteroaryl, substituted C 5-6 heteroaryl, C 4-12 heterocycloalkylalkyl, substituted C 4-12 heterocycloalkylalkyl, C 6-12 heteroarylalkyl, substituted C 6-12 heteroarylalkyl, and —(CH R6 ) n —OPO(OH) 2 wherein n is chosen from 1, 2, and 3, and each R 6 is independently chosen from hydrogen and methyl; R 2 is chosen from hydrogen, C 1-6 alkyl, substituted C 1-6 alkyl, C 3-6 cycloalkyl, substituted C 3-6 cycloalkyl, phenyl, and substituted phenyl; and R 3 is chosen from hydrogen, —PO(OH) 2 , and —C(O)R 4 wherein R 4 is C 1-4 alkyl.