The isolation and determination of structure of some plant procyanidins in their free phenolic forms are described. The distribution of procyanidins in the tissues of twenty-nine plant species has been examined and the biogenetic implications of this study are briefly discussed.
In this paper, shikimic acid is numbered systematically, with the double bond in the 1,2-position; quinic acid is numbered according to the ' Tentative Rules for Cyclitol Nomenclature ' (I.
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