Tannins and related compounds. XVII. Galloylhamameloses from Castanea crenata L. and Sanguisorba officinalis L.

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.