A new flavonoid, quercetin 3-O-α-L-rhamnopyranosyl-(1→6)-(2-E-p-coumaroyl)-β-D-glucopyranoside-4′-O-α-L-rhamnopyranoside, was isolated from the fermented tea of Camellia sinensis L. (Pu-erh tea) from China. The chemical structure was elucidated based on analyses of the spectroscopic data.
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