Abstract
From the leaves of Xylopia vielana (Annonaceae) two dimeric guaianes named vielanins D and E were isolated and structurally elucidated by mass and NMR spectroscopy. Vielanin D and E consist of bridged ring systems formally representing the Diels–Alder products from the hypothetical guaiane-type monomers. Due to a hemiketal function at C-8′ both compounds occurred as epimeric mixtures.
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