The HPLC-analysis was performed on an Agilent LC series 1200 HPLC system (Agilent Technologies, Urdorf, Switzerland) equipped with a quaternary gradient pump, a membrane degasser, a rheodyne injection valve with a 20 mL loop and a diode array detector
The HPLC-analysis was performed on an Agilent LC series 1200HPLC system (Agilent Technologies, Urdorf, Switzerland) equippedwith a quaternary gradient pump, a membrane degasser, a rheodyneinjection valve with a 20 mL loop and a diode array detector