Table 5.

Preparative LC conditions: Knauer Eurospher II 100-5 C18 P (250 × 4 mm; 5 µm) column; flow rate: 1 mL/min; column oven temperature: 35 °C; injection volume: 100 µL; runtime: 35 min; eluents: H₂O + 20 mM NH₃; acetonitrile; DAD wavelength: 254 nm.

Time [min]	H2O + 20 mM NH3 [%]	Acetonitrile [%]
0	62	38
14	62	38
16	35	65
22	35	65
22.1	0	100
27	0	100
27.1	62	38
33	62	38