Patent ID: 7482336

Claim:
A compound of the formula I: or a pharmaceutically acceptable salt thereof; wherein X is a bond; Ar is phenyl unsubstituted or substituted with one to five R 1 substituents; each R 1 is independently selected from the group consisting of fluorine, chlorine, bromine, methyl, trifluoromethyl, and trifluoromethoxy; R 3 and R 4 together with the nitrogen atom to which they are attached form an optionally fused nitrogen-containing heterocyclic ring selected from the group consisting of: wherein said heterocyclic ring is unsubstituted or substituted with one to three R a substituents independently selected from oxo, hydroxy, halogen, C 3-6 cycloalkyl, C 1-4 alkoxy, and C 1-4 alkyl, wherein cycloalkyl, alkyl and alkoxy are unsubstituted or substituted with one to five fluorines.