(1’R,2’R,3aS,3″aS,8aR,8″aR)-(+)-3,3″,3a,3″a,8,8″,8a,8″a-Octahydrodispiro{2H-indeno[1,2-d]oxazole-2,1′-cyclohexane-2′,2″-[2H]indeno[1,2-d]oxazole}