title: C21 steroidal glycosides from Cynanchum wallichii Wight.
abstract: Three new C21 steroidal glycosides, characterized with rostratamine and qinyangshengenin as aglycone moiety and 2,6-dideoxy-pyranoses as component sugars, have been isolated from the roots of Cynanchum wallichii Wight. The structures of the three new C21 steroidal glycosides were elucidated as rostratamine-3-O-beta-D-oleandropyranosyl-(1 --> 4)-beta-d-cymaropyranosyl-(1 --> 4)-beta-D-cymaropyranoside, qinyangshengenin-3-O-beta-D-cymaropyranosyl-(1 --> 4)-beta-D-digitoxo-pyranoside, and qinyangshengenin-3-O-beta-D-oleandropyranosyl-(1 --> 4)-beta-D-cymaropyranosyl-(1 --> 4)-beta-D-digitoxopyranoside.
authors.affiliation: School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, China.
authors.forename: Gang
authors.initials: G
authors.lastname: Chen
authors.forename: Nan
authors.initials: N
authors.lastname: Xu
authors.forename: Yue-Hu
authors.initials: YH
authors.lastname: Pei
mesh_terms: D031105:Cynanchum / Q000737:chemistry*; D004365:Drugs, Chinese Herbal / Q000737:chemistry / Q000302:isolation & purification*; D006027:Glycosides / Q000737:chemistry / Q000302:isolation & purification*; D015394:Molecular Structure; D010840:Phytosterols / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: D004365:Drugs, Chinese Herbal; D006027:Glycosides; D010840:Phytosterols; C539880:qinyangshengenin-3-O-beta-D-cymaropyranosyl-(1-4)-beta-D-digitoxo-pyranoside; C539878:qinyangshengenin-3-O-beta-D-oleandropyranosyl-(1-4)-beta-D-cymaropyranosyl-(1-4)-beta-D-digitoxopyranoside; C539879:rostratamine-3-O-beta-D-oleandropyranosyl-(1-4)-beta-D-cymaropyranosyl-(1-4)-beta-D-cymaropyranoside