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Comparison of Structure and Senegenin Content of Roots in Polygala tenuifolia Willd and P.sibirica L. Germplasm resources of Polygala tenuifolia and determination of presenegenin in processing products Determination of dehydroxypresenegenin in Polygalae tenuifolia by HPLC Localization and Dynamic Change of Saponin in Vegetative Organs of Polygala tenuifolia Triterpenoid Saponins from Yellowflower Milkwort Root (Polygala arillata) Four new triterpenoid saponins from Polygala crotalarioides