The structure and stereochemistry is described of the first member of a new class of natural biflavanoid proanthocyanidins which contain a single carboxyl group: the acid is associated with chemically related biflavanoids and their precursors.
I. C. du Preez, A. C. Rowan and D. G. Roux, J. Chem. Soc. D, 1970, 492 DOI: 10.1039/C29700000492
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