Polyflavanostilbene B ( 1 ), an unusual adduct of epicatechin-3- O -gallate fused to piceid through a carbon–carbon bond, four new dimeric stilbene glycosides ( 2–5 ), and four new compounds ( 6–9 ), were isolated from the rhizome of Polygonum cuspidatum .
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Yang et al. (2016) studied this question.
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