Abstract
Two new C21 steroidal glycosides with a new aglycone of amplexicogenin B were isolated from Cynanchum amplexicaule Sieb. et Zucc. Their structures were elucidated as amplexicogenin B-3-O-β-d-cymaropyranoside (1), amplexicogenin B-3-O-β-d-cymaropyranosyl-(1 → 4)-α-l-cymaropyranosyl-(1 → 4)-β-d-cymaropyranoside (2) by means of spectral and chemical analysis.