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organic compounds
In methyl (3S,5S,6S,10R,11R)-2-bromo-3,6-epoxy-8-isopropyl-5-methyl-9-oxotricyclo[9.3.0.05,10]tetradeca-1,7-diene-10-carboxylate, C20H25BrO4, the seven-membered ring is half-chair shaped, the six-membered ring adopts a boat conformation and the five-membered rings both adopt envelope conformations. The molecule adopts an overall hemispherical conformation.