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The title compound, C 27 H 34 O 5 , a beyerane-type diterpenoid prepared by peroxidation and benzoyl­ation of isosteviol, contains a fused six-membered ring system. The O atoms of the benzoic ester and the lactone are disordered with occupancy ratios of 0.6 (4):0.4 (4) and 0.6 (2):0.4 (2), respectively. Three cyclo­hexane rings have chair conformations, whereas the remaining lactone ring adopts a half-chair conformation.

19-Benzoyloxy-13,16-seco-ent-beyeran 13,16-lactone