Patent ID: 7407970

Claim:
An 8-aza-bicyclo[3.2.1]octane derivative of the Formula I: or any of its isomers or any mixture of its isomers, or a pharmaceutically acceptable salt thereof, wherein R a represents hydrogen; X represents —O—; R b represents an aryl group selected from monosubstituted phenyl, which group is substituted with a substituent selected from the group consisting of trifluoromethoxy, cyano, hydroxy, and alkoxy; or R b represents an aryl group selected from disubstituted phenyl which group is substituted with substituents independently selected from the group consisting of halo, trifluoromethyl, trifluoromethoxy, cyano, hydroxy, and alkoxy; or R b represents a heteroaryl group selected from naphthyl, pyridyl, quinolinyl, isoquinolinyl or quinazolinyl, which heteroaryl group is substituted with one or two substituents independently selected from the group consisting of halo, trifluoromethyl, trifluoromethoxy, cyano, hydroxy, and alkoxy.