capitalizing on a highlyselective Claisen rearrangement, ent-galbanic acid 1 and (+)-marneral 2 have been synthesized. The relative configurations of (+)- 1 and (+)- 2 were unambiguously established by X-ray crystallographic analysis of the precursors 11a and 20, with the absoluteconfiguration ensuing from their derivation from R-pulegone. In this way, the controversial issue of the configuration of galbanic