Patent ID: 7294623

Claim:
A compound of formula (I) wherein R is H; Ar is an aromatic group selected from unsubstituted phenyl or phenyl substituted with 1, 2, 3, 4 or 5 substitutents selected from C 1 -C 4 alkyl, O(C 1 -C 4 alkyl), S(C 1 -C 4 alkyl), halo, and phenyl optionally substituted with halo, C 1 -C 4 alkyl or O(C 1 -C 4 alkyl); X is unsubstituted phenyl or phenyl substituted with 1, 2, 3, 4 or 5 substituents selected from C 1 -C 4 alkyl, O(C 1 -C 4 alkyl), and halo; R′ is H or C 1 -C 4 alkyl; each R 1 is independently H or C 1 -C 4 alkyl; wherein each above-mentioned C 1 -C 4 alkyl group is optionally substituted with one or more halo atoms; or a pharmaceutically acceptable salt thereof.