(wikiの解説)
「Piceatannol is a *metabolite of resveratrol found in red wine, grapes, passion fruit,white tea, and Japanese knotweed.*Astringin, a piceatannol glucoside, is also found in red wine.Piceatannol and its glucoside, *astringin, are phenolic compounds found in *mycorrhizal andnon-mycorrhizal roots of Norway spruces (*Picea abies).It can also be found in the seeds ofthe palm *Aiphanes horrida and in* Gnetum cleistostachyum.The chemical structure of piceatannol was established by Cunningham et al. as being an analog of resveratrol(wiki)」