Tannins and Related Polyphenols of Lythraceous Plants. Part2. Woodfordin D and Oenothein A, Trimeric Hydrolyzable Tannins of Macro-Ring Structure with Antitumor Activity.

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Abstract
Two new antitumor trimeric hydrolyzable tannins, woodfordin D (5) and oenothein A (13), were isolated from the dried flowers of Woodfordia fruticosa, and their macrocyclic structures, which have a novel constituent unit (woodfordinoyl group) connecting the monomers, have been elucidated on the basis of spectral and chemical evidence. Oenothein A (13) was also isolated from the leaves of Oenothera biennis.

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