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(A) Base peak chromatogram (BPC) showing the sodium formate cluster peak at 7.0 min. BPC obtained by HILIC-ESI-QTOF MS in positive ion mode. (B) ESI-MS of sodium formate ion cluster in positive ESI mode. (C) Proposed mechanism of neutral losses of 68 Da, i.e., sequential elimination of HCOONa (67.9874 Da) units.
