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The elution was accomplished with the following gradient: 0 to 10 min, acetonitrile; and 10 to 20 min, acetonitrile to 100% dichloromethane.
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5 to 10 min, 100% acetonitrile; 10 to 15 min, acetonitrile to 100%
dichloromethane; and 15 to 20 min dichloromethane, at a constant
flow rate of 1 mL/min.¡±
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