Objective: To study the lignan of Polygonum capitatum.
Methods: The compounds were isolated and purified by using of SiO2, Sephadex LH-20 column chromatography and pre-HPLC. The structures of the compounds were determined on the basis of their physical properties and the spectral data.
Results: Four compounds were isolated and identified as schizandriside (1), (-)-isolariciresinol-2a-O-beta-D-xylopyranoside (2), (-) -5 '-methoxyisolariciresinol-2a-O-beta-D-xylopyranoside (3) and nudiposide (4).
Conclusion: Compounds 1 - 4 are isolated from the genus for the first time.
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