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Identification of a selected marker (m/z=137.0458). (a) Extracted ion chromatogram (EIC) of a commercial standard hypoxanthine (tR=0.996 min); (b) EIC of m/z 137.05 (tR=0.997min); (c) MS/MS spectrum of a commercial standard hypoxanthine; (d) MS/MS spectrum of the ion. The collision energy was 10V.
