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Chiral separation and absolute configurations of two pairs of racemic polyprenylated benzophenones from Hypericum sampsonii.
Fitoterapia 2017 January
(±) Sampsonins A-B (1-2), two pairs of racemic polyprenylated benzophenones, were isolated from the aerial parts of Hypericum sampsonii and successfully separated by chiral HPLC column. Their structures were elucidated by spectroscopic analyses, X-ray diffraction analysis, and quantum chemical calculation of ECD method. Besides, the plausible biogenetic pathways of 1-2 were proposed, and all of them were evaluated for RXRα transcriptional-inhibitory activities and cytotoxicity against HeLa cells.
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