The title compound, C27H34O5, 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.