Abstract
Two novel flavono-ellagitannins, mongolicins A (1) and B (4), in which hydrolysable tannin and flavonoid moieties are connected through a carbon-carbon linkage, were isolated from the bark of Quercus mongolica var. grosseserrata, together with a large quantity of (+)-taxifolin 3-O-β-D-glucopyranoside (3).
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