| Instrument | Condition |
|---|---|
| Column | YMC Hydrosphere C18 column (YMC, Kyoto, Japan) |
| Mobile phase | 0.1M ammonium acetate (pH 4.7): 1-propanol=9:1 (v/v) |
| Detector (detection) | Photodiode Array Detector W996 (257 nm; Waters, Milford, CT, USA) |
| Flow rate | 0.8 mL/min |
| Injection volume | 15 μL |