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Purity evaluations of the separated compounds on the YMC-Pack ODS-AQ column (250 × 4.6 mm). Conditions: mobile phase: A: 0.2% formic acid in water, and B: acetonitrile; gradient: 0–50 min, 10%–30% B, 50–65 min, 30% B; flow rate: 1.0 mL/min; column temperature: 25 °C; monitoring wavelength: 269 nm.
