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Study of a false positive of PnTX-F in sample MUS120523: (A) extracted ion chromatogram of the precursor ion (766.4889 m/z) in the MS scan, and an extracted chromatogram of the diagnostic fragments (164.1434 m/z and 446.3265 m/z) in the MS2 product scan (10 ppm mass window in both cases); (B,C) isotopic pattern of the precursor ion (simulated and found, respectively); and (D) MS2 product scan on the precursor ion (766.5 m/z).
