2-{[(1R,2R,3S,5S)-3-(4-Fluoro-phenyl)-8-methyl-8-aza-bicyclo[3.2.1]oct-2-ylmethyl]-[2-(4-methoxy-benzylsulfanyl)-ethyl]-amino}-N-[2-(4-methoxy-benzylsulfanyl)-ethyl]-acetamide