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Proguibourtinidin

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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) or in Cassia abbreviata.

References

Steynberg, Jan P.; Ferreira, Daneel; Roux, David G. (1987). "Synthesis of condensed tannins. Part 18. Stilbenes as potent nucleophiles in regio- and stereo-specific condensations: Novel guibourtinidol-stilbenes from Guibourtia coleosperma". Journal of the Chemical Society, Perkin Transactions 1: 1705–1712. doi:10.1039/P19870001705.
Malan, Elfranco; Swinny, Ewald; Ferreira, Daneel; Steynberg, Petrus (1996). "The structure and synthesis of proguibourtinidins from Cassia abbreviata". Phytochemistry. 41 (4): 1209–1213. Bibcode:1996PChem..41.1209M. doi:10.1016/0031-9422(95)00656-7.

v t e Condensed tannins
Oligomers	Procyanidins Prodelphinidins Profisetinidins Proguibourtinidins Promelacacinidins Propelargonidins Prorobinetidins Proteracacinidins
Misc.	Phlobaphenes (phlobatannins) Tannin sources Tannosome

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