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A new dibenzocyclooctene-type lignan, named schisandrin A1 (1), together with nine known lignans (2–10), was isolated from the stems of Schisandra sphenathera. The structure of schisandrin A1, which contains a spirocyclic epoxy unit, was established by means of spectroscopic methods. The absolute configurations of schisandrin A1 (1) and schisantherin A (2) were determined by electronic circular dichroism...
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