Patent ID: 8455533

Claim:
A compound of structural formula I: or a pharmaceutically acceptable salt thereof; wherein V is selected from the group consisting of: Ar is phenyl unsubstituted or substituted with one to five halogen atoms; R 1 and R 2 are each independently selected from the group consisting of: C 1 -C 6 alkyl; cycloalkyl; heterocyclyl; and heteroaryl; R 3 is selected from the group consisting of: C 1 -C 6 alkyl; cycloalkyl; heterocyclyl; cyano; heteroaryl; —C(O)O C 1 -C 6 alkyl; and —C(O)NH 2 ; wherein each C 1-6 alkyl, cycloalkyl, heteroaryl, and heterocyclyl is unsubstituted or substituted with 1-4 substituents independently selected from the group consisting of: cyano; —OH; —C(O)NH 2 ; —CO 2 H; —C(O)OC 1-6 alkyl; halogen; oxo; and —C(O)heterocyclyl.