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The title compound, C 22 H 34 O 3 , was synthesized from isosteviol. The asymmetric unit contains of two independent mol­ecules with the same absolute configurations. In both the mol­ecules, the three six-membered rings adopt chair conformations, the stereochemistry of the  A / B  and  B / C  ring junctions are  trans , and the five-membered ring  D  adopts an envelope conformation.

acta crystallographica. section e

Ethyl (1R,4S,5R,9S,10R,13S)-5,9,13-trimethyl-14-methylene-14-oxotetracyclo[11.2.1.01,10.04,9]hexadecane-5-carboxylate