R factor = 0.060; wR factor = 0.128; data-to-parameter ratio = 11.3. The molecule of the title compound, C23H34O6, is built up from three fused carbocycles, one five-membered, one sixmembered and one seven-membered. The five-membered ring has an envelope conformation, whereas the six-membered ring has a perfect chair conformation and the sevenmembered ring has a boat conformation. Intramolecular C— H O hydrogen bonds together with van der Waals interactions stabilize the molecular conformation. Related literatur
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