X-Ray Crystallographic Analysis of Methyl (1S,2R,5R,6S,7R)-5,6-Dimethyl-2-(ω-camphanoyloxy)bicyclo[4.3.0]nonane-7-carboxylate. Revision of the Absolute Configurations of the Liverwort Sesquiterpenoids (−)-Chiloscyphone and (+)-Chiloscypholone

Abstract
The X-ray analysis of the title compound has been carried out to give unambiguous assignment of the absolute configurations of the liverwort sesquiterpenoids (−)-chiloscyphone and (+)-chiloscypholone, each for which the enantiomerically opposite configurations had been assigned in the previous report.