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Isomers of amygdalin in BUYANG HUANWU TANG and its production Preparation of antitumor component 25-OH-PPD isomers by RP-HPLC-ELSD Chemical constituents of Leucas ciliata The Isolation and Structures of Kaji-lchigoside Fl and Rosamultin Study on excretion of 20(S)-protopanaxadiolocotillol type epimers in rats Review on epimerization of tea catechins Separation of 20(S)-Ginsenoside-Rg2 and Its 20(R) Epimer by Reversedphase Low Pressure Column (Rp-18) Chromatography Chemical constituents of Leucas ciliata