Analogous to the CV and ESR results, RsvH3 and PiceH4 scavenge the electrogenerated O2 •- via PCET based on their structural characteristics as polyphenol stilbenoids. To the best of our knowledge, this is the first report of the ESR spectrum of the piceatannol radical, which was made observable using the in situ spectroelectrochemical system in well-dried aprotic DMF solution. In addition, a difference in the stabilities of their product radicals (PiceH2