Patent ID: 8871928

Claim:
A compound of Formula (I) or a pharmaceutically acceptable salt thereof, wherein: Z is selected from the group consisting of C 1 -C 3 alkyl, —O—(C 1 -C 3 alkyl) and halo; m is 0, 1, 2 or 3; X is O; Y is —(CH 2 ) n —, wherein n is 0, 1, 2, or 3; Ar is phenyl or heteroaryl, either of which is optionally substituted with one or more substituents selected from the group consisting of CN, halo, C 1 -C 3 alkyl, C 1 -C 3 alkoxy and C 1 -C 3 haloalkyl; and Ar′ is phenyl or heteroaryl, either of which is optionally substituted with one or more substituents selected from the group consisting of CN, halo, C 1 -C 3 alkyl, C 1 -C 3 alkoxy and C 1 -C 3 haloalkyl.