Patent ID: 7659408

Claim:
A compound of structural formula I: or a pharmaceutically acceptable salt thereof, wherein each n is independently 0, 1, or 2; R 1 is methyl; R 2 is aryl or heteroaryl, or heteroarylmethyl, wherein aryl and heteroaryl are unsubstituted or substituted with one to four R 6 substituents; R 3 is hydrogen, chlorine, or methyl; R 4 and R 5 together with the nitrogen atom to which they are attached form a 5- to 7-membered ring saturated heterocycle optionally containing an additional heteroatom selected from O, S, and NC 0-4 alkyl wherein said heterocycle optionally fused with a benzene ring and wherein said heterocycle or optionally benzo-fused heterocycle is unsubstituted or substituted with one to three substituents independently selected from halogen, C 1-4 alkyl, trifluoromethyl, and (CH 2 ) n aryl wherein aryl is unsubstituted or substituted with one to three substituents independently selected from halogen and C 1-4 alkyl; and each R 6 is independently selected from the group consisting of: amino, C 1-4 alkylamino, di(C 1-4 alkyl)amino, halogen, cyano, C 1-4 alkyl, hydroxy, C 1-4 alkoxy, C 1-4 alkylthio, C 1-4 alkylsulfonyl, trifluoromethyl, trifluoromethoxy, aryl, and heteroaryl; wherein aryl and heteroaryl are unsubstituted or substituted with one to three substituents independently selected from cyano, halogen, hydroxy, C 1-4 alkoxy, C 1-4 alkyl, trifluoromethyl, and trifluoromethoxy.