As shown in Figure 3 , the chromatographic peak areas obtained in both positive and negative ion modes indicate that the contribution of the rarely found compounds identified in this study to the total flavonoid glycoside content is quite significant.
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Extremely Rare Flavonoid Glycosides Identified in the Stems of <i>Ephedra gerardiana</i> by HPLC-MS and Their Antioxidant Activity.
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