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Base peak ion (BPI) chromatogram of chemical components of QZD based on UPLC–Q-TOF/MS. (A) BPI chromatogram of mixed standard in ESI+ mode, (B) BPI chromatogram of mixed standard in ESI– mode, (C) BPI chromatogram of QZD in ESI+ mode, and (D) BPI chromatogram of QZD in ESI– mode.
