title: C21 steroidal glycosides of seven sugar residues from Cynanchum otophyllum.
abstract: Two new C21-steroidal glycosides having hepta-saccharide residue were isolated from the rhizome of Cynanchum otophyllum Schneid. Their structures were determined to be caudatin 3-O-alpha-L-cymaropyranosyl-(1-->4)-alpha-D-oleandropyranosyl-(1-->4)-alpha-l-cymaropyranosyl-(1-->4)-beta-d-glucopyranosyl-(1-->4)-alpha-D-oleandropyranosyl-(1-->4)-beta-D-oleandropyranosyl-(1-->4)-beta-D-diginopyranoside (1), and caudatin 3-O-beta-D-cymaropyranosyl-(1-->4)-alpha-D-oleandropyranosyl-(1-->4)-alpha-L-cymaropyranosyl-(1-->4)-beta-D-glucopyranosyl-(1-->4)-beta-D-oleandropyranosyl-(1-->4)-beta-D-cymaropyranosyl-(1-->4)-beta-D-diginopyranoside (2) by spectral methods, respectively.
authors.affiliation: State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Yunnan, Kunming 650204, People's Republic of China.
authors.forename: Yi-Bin
authors.initials: YB
authors.lastname: Zhao
authors.forename: Hong-Ping
authors.initials: HP
authors.lastname: He
authors.forename: Chun-Hua
authors.initials: CH
authors.lastname: Lu
authors.forename: Quan-Zhang
authors.initials: QZ
authors.lastname: Mu
authors.forename: Yue-Mao
authors.initials: YM
authors.lastname: Shen
authors.forename: Xiao-Jiang
authors.initials: XJ
authors.lastname: Hao
mesh_terms: D002236:Carbohydrate Conformation; D002240:Carbohydrate Sequence; D002241:Carbohydrates / Q000737:chemistry*; D031105:Cynanchum / Q000737:chemistry*; D006027:Glycosides / Q000737:chemistry*; D008969:Molecular Sequence Data; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D010936:Plant Extracts / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry; D013256:Steroids / Q000737:chemistry*
chemical_list: D002241:Carbohydrates; D006027:Glycosides; D010936:Plant Extracts; D013256:Steroids