The Liquid Chromatographic Determination of Chlorogenic and Caffeic Acids in Xu Duan (<i>Dipsacus asperoides</i>) Raw Herb

<table>Structure of chlorogenic acid (a) and caffeic acid (b).</table>

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Figure 1: The Liquid Chromatographic Determination of Chlorogenic and Caffeic Acids in Xu Duan (<i>Dipsacus asperoides</i>) Raw Herb 