The gradient system of water (A) and acetonitrile (B) was run at a ow rate of 0.64 mL/min. The linear gradient was started with 50% B for 2 min, then ramped to 100% B within 6 min and maintained for 3.2 min. Finally, B was-in to 50% within 1 min and maintained for 2.8 min. ...
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