ESI-MS/MS measurements were performed in negative MRM detection mode. Mass spectrometer parameters for ESI-MS/MS were as follows: desolvation gas (N2) flow rate: 650 L h‒1, desolvation temperature: 350 °C; source temperature: 120 °C; cone gas: nitrogen at flow rate of 100 L h‒1; capillary voltage: ‒3 kV; collision gas: argon under pressure
of 2.40 × 10‒6 Pa. The other parameters are listed in Table 1.