Studies on the constituents of asclepiadaceae plants. LIV. The structures of glaucoside-F and -G from the chinese drug "pai-ch'ien," Cynanchum glaucescens Hand-Mazz.

Abstract

The glycosides of the Chinese Crude drug Pai-ch'ien have been further investigated. Two new glycosides named glaucoside-F (8) and -G (9) were isolated and their structures were characterized on the bases of spectroscopic evidence and analyses of their hydrolysates by thin-layer chromatography (TLC). They were found to possess α-L-cymaropyranose at the terminal of their sugar chains, like glaucoside-B (4), -C (5), -D (6), and -E (7).