Journal
HELVETICA CHIMICA ACTA
Volume 89, Issue 1, Pages 103-110Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/hlca.200690000
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Two new flavanones, tonkinochromanes A (1) and B (2), and a new chalcone. tonkinochromane C (3), were isolated from the roots and rhizomes of Sophora tonkinensis. Their structures were elucidated by spectroscopic methods including 2D-NMR and MS experiments. Of the three isoprenyl substituents in these compounds on rings A and B, one to two were found to be ring-fused in the form of either dihydro- or regular 2,2-dimethyl-2H-pyran moieties.
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