The TWIM–MS experiments were performed under a Waters Synapt G2 mass spectrometer under the following conditions: ESI capillary voltage, 3kV; sample cone voltage, 30V; extraction cone voltage, 3.5V; source temperature, 100°C; desolvation temperature, 100°C; cone gas flow, 10lh−1; desolvation gas flow, 700lh−1 (N2); source gas control, 0mlmin−1; trap gas control, 2mlmin−1; helium cell gas control, 100mlmin−1; ion mobility cell gas control, 30mlmin−1; sample flow rate, 5μlmin−1; ion mobility travelling wave height, 25V; and ion mobility travelling wave velocity, 1,000ms−1
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