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HPLC: Agilent 1200
Column: 5 µm LiChrospher RP-18, 4.6mm * 250mm
Injection volume: 50µL
Flow rate: 1mL/min
Mobile phase: acetonitrile and water
Gradient: 0 min, 90% water and 10% acetonitrile
              20 min, 50% water and 50% acetonitrile
              30 min, 0% water and 100% acetonitrile
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