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Base peak intensity (BPI) chromatogram of sample A11 in positive ion mode. Column: Waters ACQUITYTM UPLC BEH C18 column (50 mm×2.1 mm i.d., 1.7 μm). Flow rate: 0.4 mL·min−1. Column temperature: 35°C. Mobile phase: a linear gradient elution with 0.1% formic acid in water and 0.1% formic acid in acetonitrile. Ion source: electrospray interface (ESI).
