Two new bibenzyl glucosides from dendrobium chrysotoxum

Abstract

Two new bibenzyl glucosides, 3,3',4',5-tetramethoxybibenzyl-4-O-β-D- glucopyranoside (1) and 3,4,4',5- tetramethoxybibenzyl-3'-O-β-D- glucopyranoside (2), together with five known ones, chrysotobibenzyl (3), erianin (4), chrysotoxine (5), gigantol (6) and tristin (7) were isolated from the stems of Dendrobium chrysotoxum. The structures of those compounds were elucidated by extensive spectroscopic analysis. Moreover, compounds 1-7 were assessed for inhibitory activity of two enzymes-AChE (acetylcholine esterase) and BChE (butyrylcholine esterase).