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. 2017 Jan 23;409(9):2309–2326. doi: 10.1007/s00216-016-0174-9

Fig. 1.

Fig. 1

Accurate mass peaks of the m/z 57 of 6PG (a), m/z 41 of Glu (b), and m/z 73 of Icit (c) in negative ionization mode. The product ion spectra were recorded in a CE range from −50 to −5 eV