Chromatographic analyses were performed using an Agilent Series 1100 HPLC system equipped with a G1315B diode array detector (Agilent Technologies) and an ion trap mass spectrometer (Esquire 6000, Bruker Daltonics) with an electrospray interface. Separation was performed in a Luna Omega Polar C18 analytical column (150 × 3.0 mm; 5 µm particle size) with a Polar C18 Security Guard cartridge (4 × 3.0 mm), both purchased from Phenomenex. Detailed chromatographic conditions are available in [59 (link)].
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