Experimental

R factor = 0.038; wR factor = 0.095; data-to-parameter ratio = 11.7. The title compound, C27H34O2, was hemisynthesized through direct benzoylation of the naturally occurring meroterpene totarol. The central fused six-membered ring has a half-chair conformation, whereas the terminal six-membered ring displays a chair conformation. The dihedral angle between the fused benzene ring and the benzoyl benzene ring is 73.05 (14). The S,S chirality of the molecule is consistent with the synthetic pathway, and confirmed by the refinement of the Flack parameter. Related literature For the synthesis and biological activity of totarol [systemati