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. 2021 Jun 24;10(7):1016. doi: 10.3390/antiox10071016

Figure 1.

Figure 1

Structural features related to the antioxidant capacity of polar phenols. (A) o-dihydroxy (catechol) moiety; (B) 2,3-double bond in conjunction with a 4-keto function and the additional presence of 3′- and 5′-hydroxyl groups.