SEARCH Articles Figures Tables Base-Catalyzed Pyran Ring Rearrangement of Oligomeric Proanthocyanidins Flavonoids Oligomeric proanthocyanidins Formation of the Interflavanyl Bond in Oligomeric Proanthocyanidins Interflavanyl Bond in Oligomeric Proanthocyanidins Oligomeric proanthocyanidin Oligomeric proanthocyanidin Polyphenols Oligomeric proanthocyanidins Proanthocyanidin Proanthocyanidins Reactions of Oligomeric Proanthocyanidins Structure and Distribution of Oligomeric Proanthocyanidins