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. Author manuscript; available in PMC: 2019 Jun 11.
Published in final edited form as: J Chromatogr B Analyt Technol Biomed Life Sci. 2018 Sep 12;1099:34–45. doi: 10.1016/j.jchromb.2018.09.014

Fig. 1.

Fig. 1.

Chemical structures of grape polyphenol precursors (catechin and epicatechin) and phenolic acid metabolites included in the study. Abbreviations are presented in Table 1.