Trriterpene glycosides ofAstragalus and their genins LIX. Structure of cyclocanthoside F

The structure of a new cycloartane glycoside, cyclocanthoside F, has been established on the basis of spectral characteristics as 20R,25-epoxy-24S-cycloartane-3,6,16,24-tetraol 3-O-[O--D-glucopyranosyl-(12)--D-xylopyranoside] 6-O--D-glucopyranoside. The possibility in principle of using the -effects of glycosylation and¹³C NMR spectroscopy for determining a glycosyl substituent at C-6 of a cycloartane has been demonstrated.Institute of the Chemistry of Plant Substances, Academy of Sciences of the Republic of Uzbekistan, Tashkent, fax (371) 120 64 75. Translated from Khimiya Prirodnykh Soedinenii, No. 3, pp. 348–353, May–June, 1999.