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. 2019 May 14;17(5):291. doi: 10.3390/md17050291

Figure 2.

Figure 2

Negative-ion mode electrospray ionization-mass spectrometry targeted fragmentation spectra (ESI−-pseudo-MS3) of the ions (m/z) 401.0383 (A, sequence 5 in Table 2), 502.9776 (B, sequence 6 in Table 2), 604.9166 (C, sequence 7 in Table 2), and 706.8558 (D, sequence 8 in Table 2).