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HPLC analysis and quantification of XJDH. HPLC chromatograms of XJDH (a) and oxypaeoniflorin, albiflorin, and paeoniflorin reference (b) obtained using a SunFire™ C18 column monitored at 254 nm and eluted with 98% water to 100% acetonitrile for 70 min at a flow rate of 1.0 mL/min.
