Acetylparabenzlactone (1), an acetylation product of (−)-parabenzlactone (2), has been newly isolated from Parabenzoin trilobum Nakai, and the stereostructures of these two piperolignanolides have also been elucidated. Furthermore, the chemical conversion of 1 to a lariciresinol-type lactone (3) has been carried out.
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