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Eight caffeoylquinic acid (CQA) derivatives have been identified from the roots of Arctium lappa L. (burdock), including three new derivatives (1–3) together with five known derivatives (4–8). Their chemical structures were determined by 1D and 2D NMR as well as HR-TOF-MS data. The free radical scavenging activities of each compound were determined experimentally and found to be significant, especially...
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