4,​7-​Methano-​1H-​isoindole-​1,​3(2H)​-​dione, 2-​[[(1R,​2R)​-​2-​[[4-​(1,​2-​benzisothiazol-​3-​yl)​-​1-​piperazinyl]​methyl]​cyclohexyl]​methyl]​hexahydro-​5-​hydroxy-​, (3aR,​4S,​5R,​7S,​7aS)​-​rel-