Tannins and Related Compounds. LXXV. : Isolation and Characterization of Novel Diastereoisomeric Ellagitannins, Nupharins A and B, and Their Homologues from Nuphar japonicum DC.
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The diastereoisomeric ellagitannins, nupharins A (1) and B (11), and related compounds (8,10,and 15), have been isolated from the rhizomes of Nuphar japonicum DC. (Nymphaeaceae). One the basis of physicochemical evidence, their structures were characterized as 1,2,4-tri-O-galloyl-(1) and 1,2-di-O-galloyl-3,6-(S)-hexahydroxydiphenoyl-α-D-glucopyranoses (8), 2-O-galloyl-3,6-(S)-hexahydroxydiphenoyl-D-glucose (10), and 1,2,4-tri-O-galloyl- (11) and 1,2-di-O-galloyl-(R)-hexahydroxydiphenoyl-α-D-glucopyranoses (15).