Patent ID: 7307164

Claim:
A compound of the formula I: or a pharmaceutically acceptable salt thereof; wherein Ar is phenyl which is unsubstituted or substituted with 1-5 substitutents which are independently selected from the group consisting of: (1) fluoro, (2) chloro, and (3) CF 3 ; X is selected from the group consisting of: (1) N and (2) CR 2 ; R 1 is selected from the group consisting of: (1) hydrogen and (2) C 1-6 alkyl, which is linear or branched and which is unsubstituted or substituted with 1-5 fluorines; R 2 is selected from: (1) hydrogen and (2) C 1-6 alkyl, which is linear or branched and which is unsubstituted or substituted with 1-5 fluorines; and R 5 and R 6 are independently selected from the group consisting of: (1) hydrogen, (2) C 1-10 alkyl, which is linear or branched and which is unsubstituted or substituted with one or more substituents selected from: (a) halogen, (b) phenyl, wherein the phenyl is optionally substituted with 1-5 substituents independently selected from halogen, OH, C 1-6 alkyl, and C 1-6 alkoxy, wherein the C 1-6 alkyl and C 1-6 alkoxy are linear or branched and optionally substituted with 1-5 halogens, and (3) phenyl which is unsubstituted or substituted with 1-3 substituents independently selected from C 1-6 alkyl, OC 1-6 alkyl, and halogen, wherein the C 1-6 alkyl and OC 1-6 alkyl are linear or branched and optionally substituted with 1-5 halogens, and (4) CO 2 C 1-6 alkyl; with the proviso that one of R 5 and R 6 is other than hydrogen.