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ESI parameters were as follows: source voltage, 3 kV; sheath gas, 30 arbitrary units (arb); auxiliary gas, 10 arb; capillary voltage, -15V; capillary temperature, 350°C; tube lens, -30 V. Quantitative NMR analysis was carried out on a Bruker Avance III (500.13M) NMR spectrometer equipped with a 5 mm 1H/D-BBO probehead (Bruker BioSpin GmbH, Rheinstetten, Germany).
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