Ethyl (1R,4S,5R,9S,10R,13S)-5,9,13-trimethyl-14-methylene-14-oxotetracyclo[11.2.1.0^1,10.0^4,9]hexadecane-5-carboxylate

The title compound, C22H34O3, 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.