Proguibourtinidin Explained

A Proguibourtinidin is a type of condensed tannins formed from guibourtinidol (leucoguibourtinidin). They yield guibourtinidin when depolymerized under oxidative conditions.

They can be found in Guibourtia coleosperma (the African rosewood)^[1] or in Cassia abbreviata.^[2]

Notes and References

1. http://www.rsc.org/publishing/journals/P1/article.asp?doi=p19870001705 Synthesis of condensed tannins. Part 18. Stilbenes as potent nucleophiles in regio- and stereo-specific condensations: novel guibourtinidol-stilbenes from Guibourtia coleosperma, Jan P. Steynberg, Daneel Ferreira and David G. Roux, 1987
2. https://archive.today/20120912164354/http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TH7-3THJ28R-19&_user=4296857&_rdoc=1&_fmt=&_orig=search&_sort=d&_docanchor=&view=c&_searchStrId=991460766&_rerunOrigin=google&_acct=C000012518&_version=1&_urlVersion=0&_userid=4296857&md5=5865966d2d570adeaac5a799bb9ed8ea The structure and synthesis of proguibourtinidins from Cassia abbreviata, Elfranco Malan,, Ewald Swinny, Daneel Ferreira and Petrus Steynberg, 1996