Tannins and Related Compounds. XVII.” Galloylhamameloses from Castanea crenata L. and Sanguisorba officinalis L.

Abstract

Together with 2’,5-di-O-galloylhamamelose (I), which had previously been designated as hamamelitannin, five new galloylhamameloses (II—VI) were isolated from the bark of Castanea crenata L. (Fagaceae). On the basis of chemical and spectroscopic evidence, their structures were characterized as 2’,3,5-tri-O-galloyl- (II), 5-O-galloyl- (III), 1,2’-di-O-galloyl- (IV), 1,2’,5-tri-O-galloyl-(V) and 1,2’,3,5-tetra-O-galloyl-D-hamamelofuranose (VI). In addition, the occurrence of two galloylhamameloses (I and II) in the underground part of Sanguisorba officinalis L. (Rosaceae) was demonstrated. © 1984, The Pharmaceutical Society of Japan. All rights reserved.