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. 2022 Nov 28;9:718. doi: 10.1038/s41597-022-01832-2

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© The Author(s) 2022

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Fig. 1 — The reversible two-electron two-proton redox reactions that are shown for the two representative molecules of (a) quinone and (b) aza-aromatic. On the molecules, the positions that are employed for the systematic chemical functionalizations are shown with the R groups.