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Condensed tannins the polyphenolic compounds that are widespread in plants have been proved to have antitumor potential. Here, we purified the bioactive condensed tannins from leaves of Ulmus pumila L. and explored their structural characteristics, antitumor effect on TFK‐1 cholangiocarcinoma cells as well as the related potential mechanism. The UV–Vis, FT‐IR spectroscopy, ESI‐Full‐MS, and thiolysis‐HPLC‐ESI‐MS...
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