Patent ID: 7687523

Claim:
A 3,9-diaza-bicyclo[3.3.1]nonane compound of formula (I): any of its stereoisomers or any mixture of its stereoisomers, or a pharmaceutically acceptable salt thereof; wherein R a represents hydrogen or alkyl; which alkyl is optionally substituted with one or more substituents independently selected from the group consisting of halo, trifluoromethyl, trifluoromethoxy, cyano, hydroxy, amino, nitro, alkoxy, cycloalkoxy, alkyl, cycloalkyl, cycloalkyl-alkyl, alkenyl and alkynyl; and R b represents a pyridyl, pyrimidyl, pyrazinyl, or pyridazinyl group; which pyridyl, pyrimidyl, pyrazinyl, or pyridazinyl group is optionally substituted with one or more substituents independently selected from the group consisting of halo, trifluoromethyl, trifluoromethoxy, cyano, nitro, hydroxy, alkoxy, cycloalkoxy, alkoxy-alkyl, cycloalkoxy-alkyl, alkenoxy, methylenedioxy, ethylenedioxy, alkyl, cycloalkyl, cycloalkyl-alkyl, alkenyl, alkynyl, alkyl-carbonyl, —NR′R″, —(C═O)NR′R″ and —NR′(C═O)R″; wherein R′ and R″ independent of each other are hydrogen or alkyl.