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. 2014 Sep 14;2014:764367. doi: 10.1155/2014/764367

Figure 3.

Figure 3

Mass spectra for catechin, m/z 289.07 (a), epicatechin gallate, m/z 441.08 (b), and PGG, m/z 939.11 (c) obtained with negative ion electrospray ionisation.