Patent ID: 7442805

Claim:
A compound having the formula: or a pharmaceutically acceptable salt or ester form thereof, wherein: X is O; and R 1 is hydrogen, C 1 -C 6 alkyl, C 3 -C 8 cycloalkyl, C 7 -C 11 bicycloalkyl, or arylalkyl; R 2 is hydrogen or C 1 -C 6 alkyl; R 3 is hydrogen; A 1 is C 6 or C 10 aryl or 4 to 10 membered heteroaryl containing 1 to 4 heteroatoms selected from N, O and S; and A 2 is C 6 or C 10 aryl, or 4 to 10 membered heteroaryl containing 1 to 4 heteroatoms selected from N, O and S; wherein said alkyl, cycloalkyl, aryl, and heteroaryl groups, alone or as part of another group, are optionally substituted with unsubstituted C 1 -C 6 alkyl; halogen; unsubstituted C 3 -C 8 cycloalkyl; hydroxyl; unsubstituted C 1 -C 6 alkoxy; —O—C 1 -C 3 perfluoroalkyl; CN; unsubstituted amino; unsubstituted alkylamino; unsubstituted dialkylamino; aryl; or 4 to 10 membered heteroaryl containing 1 to 4 heteroatoms selected from N, O and S.