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Abstract | Cited by

Przewalskone (1), an unprecedented adduct of two different terpenoid units via a hetero-Diels–Alder cycloaddition, was isolated from the roots of Salvia przewalskii. The structure and absolute configurations were elucidated by extensive analysis of NMR spectra and crystal X-ray diffractions. Compound 1 exhibited significant cytotoxicities against five human cancer lines in vitro (IC50 0.69–2.35 μM).

Graphical abstract: Przewalskone: a cytotoxic adduct of a danshenol type terpenoid and an icetexane diterpenoid via hetero-Diels–Alder reaction from Salvia przewalskii

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