Patent ID: 7354920

Claim:
A compound of formula (I): wherein: Rx is H; Ry is H or C 1 -C 4 alkyl; each Rz is independently H or C 1 -C 4 alkyl; X represents O; Y represents OH or OR; R is C 1 -C 4 alkyl; Ar 1 is a phenyl ring or a 5- or 6-membered heteroaryl ring, each of which can be substituted with 1, 2, 3, 4 or 5 substituents depending upon the number of available substitution positions, each independently selected from the group consisting of C 1 -C 4 alkyl, O(C 1 -C 4 alkyl), S(C 1 -C 4 alkyl), halo, hydroxy, pyridyl, thiophenyl, and phenyl optionally substituted with 1, 2, 3, 4 or 5 substituents each independently selected from the group consisting of halo, C 1 -C 4 alkyl, and O(C 1 -C 4 alkyl); and Ar 2 is a phenyl ring or a 5- or 6-membered heteroaryl ring, each of which can be substituted with 1, 2, 3, 4 or 5 substituents depending upon the number of available substitution positions, each independently selected from the group consisting of C 1 -C 4 alkyl, O(C 1 -C 4 alkyl) and halo; 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.