Abstract
The glycosides of the Chinese crude drug"Pai-ch'ien"("Bai-qian") were further investigated. Column chromatography of the polar portion of the crude glycosides of this drug gave three new glycosides named glaucoside-H (1), -I (2), and -J (3), and their structures were characterized on the bases of spectroscopic evidence and hydrolytic degradative studies. The structure of a new disaccharide named glaucobiose (12), formed by hydrolyses of 1, 2, and 3, was also characterized as 4-O-β-D-glucopyranosyl-L-cymaropyranose. Compounds 1 and 2 were found to correspond to 4'''-O-β-D-glucopyranosyl derivatives of glaucoside-C (4) and glaucoside-B (5) previously reported, respectively. Compound 3 is a glycoside having glaucogenin-B as the aglycone, and its sugar moiety corresponds to that of the 4'''-O-β-D-glucopyranosyl derivative of glaucoside-D (7) previously reported.
