The isolation of (+)-catechin 3-gallate and a polymeric proanthocyanidin from Bergenia crassifolia and B. cordifolia is described. Some properties of the polymer are discussed and a biosynthetic pathway for its formation is proposed.
E. Haslam, J. Chem. Soc. C, 1969, 1824 DOI: 10.1039/J39690001824
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