title: Seven new steroidal glycosides from the roots of Cynanchum forrestii.
abstract: Seven new steroidal glycosides, cynaforrosides K (1), L (2), M (3), N (4), and Q (7), based on a 13,14:14,15-disecopregnane-type aglycone, and cynaforrosides O (5) and P (6) with a 14,15-secopregnane-type aglycone, were isolated from the 95% ethanol extract of the roots of Cynanchum forrestii Schlechter. The structures of new compounds were determined on the basis of spectroscopic and chemical evidence. The sugar units of cynaforrosides K-P contained two moieties of glucoses with the mode of 1-->4 linkage and those of cynaforrosides K-O contained six moieties of sugars.
authors.affiliation: Key Laboratory of Bioactive Substances and Resources Utilization of Chinese Herbal Medicine, Ministry of Education, Peking Union Medical College, Beijing 100050, People's Republic of China.
authors.forename: Yue
authors.initials: Y
authors.lastname: Liu
authors.forename: Jing
authors.initials: J
authors.lastname: Qu
authors.forename: Shi-Shan
authors.initials: SS
authors.lastname: Yu
authors.forename: You-Cai
authors.initials: YC
authors.lastname: Hu
authors.forename: Xiang-Zhong
authors.initials: XZ
authors.lastname: Huang
mesh_terms: D002240:Carbohydrate Sequence; D031105:Cynanchum / Q000737:chemistry*; D006027:Glycosides / Q000737:chemistry* / Q000302:isolation & purification; D008969:Molecular Sequence Data; D015394:Molecular Structure; D018517:Plant Roots / Q000737:chemistry; D013256:Steroids / Q000737:chemistry* / Q000302:isolation & purification
chemical_list: D006027:Glycosides; D013256:Steroids