Patent ID: 7338961

Claim:
A compound of the formula I or a pharmaceutically acceptable salt thereof, wherein: R 1 is phenyl, 4-chlorophenyl or 4-fluorophenyl; R 2 is 4-pyridyl, optionally substituted with up to 4 groups that are independently (C 1 -C 6 ) alkyl, halogen, haloalkyl, —OC(O)(C 1 -C 6 alkyl), —C(O)O(C 1 -C 6 alkyl), —CONR′R″, —OC(O)NR′R″, —NR′C(O)R″, —CF 3 , —OCF 3 , —OH, C 1 -C 6 alkoxy, hydroxyalkyl, —CN, —CO 2 H, —SH, —S-alkyl, —SOR′R″, —SO 2 R′, —NO 2 , or NR′R″, wherein R′ and R″ are independently H or (C 1 -C 6 ) alkyl, and wherein each alkyl portion of a substituent is optionally further substituted with 1, 2, or 3 groups independently selected from halogen, CN, OH, and NH 2 ; R 4 is H or alkyl; and n is 1 or 2.