Cycloartane triterpene glycosides from Astragalus trigonus

Three new cycloartane glycosides, trigonoside I, II and III, and the known astragalosides I and II were isolated from the roots of Astragalus trigonus . The structures of the new glycosides were totally elucidated by high field (600 MHz) NMR analyses as cycloastragenol-6- O - β -xylopyranoside, cycloastragenol-3- O -[ α -l-arabinopyranosyl(1 → 2)- β -d-xylopyranosyl]-6- O - β - d-xylopyranoside and cycloastragenol-3- O -[ α -l-arabinopyranosyl(1 → 2)- β -d-(3- O -acetyl)-xylopyranosyl]-6- O - β -d-xylopyranoside.