β-Dihydroentandrophragmin–Ethyl Acetate (1/0.355)

Although the title compound, C₄₃H₅₈O₁₇.0.355C₄H₈O₂, from Entandrophragma cylindricum, exhibits significant disorder in its ester side chains, it was possible to determine the absolute configurations of the (2S)-2-methylbutanoate and (2S)-2-hydroxy-2-methylbutanoate sidechain groups by comparison with the stereochemistry of the core secotetranortriterpenoid skeleton.

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