Abstract
Two novel hydrolyzable tannins, alienanins A (5) and B (13), have been isolated from the leaves of Quercus aliena GLUME (Fagaceae), and their structures were elucidated on the basis of chemical and spectroscopic evidence to be dimeric C-glycosidic ellagitannins in which the hexahydroxydiphenoyl ester group is linked to the C-glycosidic C-1 atom through a carbon to carbon linkage. In addition, the structure elucidation of the monomeric C-glycosidic ellagitannin, epipunicacortein A (1), is also described briefly.
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