Tannins and related polyphenols of theaceous plants. IV. Monomeric and dimeric hydrolyzable tannins having a dilactonized valoneoyl group from Schima wallichii KORTH

Article abstract of DOI:10.1248/cpb.39.2247

Two new hydrolyzable tannins, schimawalins A (10) and B (17), have been isolated from the dried flowers of Schima wallichii (DC) KORTH. (Theaceae), and their structures, having a dilactonized valoneoyl group in the molecule, were established based on spectral and chemical evidence. Eight known hydrolyzable tannins, including camelliin B (8), the main constituent of the flower, with a macrocyclic dimer structure, were also isolated. The orientation of the valoneoyl groups in camelliin B was completely determined.

Full text of DOI:10.1248/cpb.39.2247

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