The structure of cycloglobiceposide B fromAstragalus globiceps

Two known compounds of the cycloartane series—cyclosieversiosides C and G—and the new glycoside cycloglobiceposide B—24R-cycloartane-3,6,16,24,25-pentaol 16,25-di-O--D-glucopyranoside 3-O--D-xylopyranoside—have been isolated from the roots ofAstragalus globiceps Bunge. The structures of the glycosides were established on the basis of the results of enzymatic and total hydrolysis and also of¹H and¹³C NMR spectra.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. 2, pp. 216–219, March–April, 1999.