title: Two C21-steroidal glycosides isolated from Cynanchum stauntoi.
abstract: Studies on the roots of Cynanchum stauntoi led to the isolation of two C21-steroidal glycosides, formally named stauntosides A and B. Their structures were elucidated on the basis of spectroscopic evidence, especially that from analysis of 2D-NMR spectra. They were found to possess an unusual skeleton and were identified as stauntogenin 3-O-alpha-L-diginopyranosyl-(1-4)-beta-L-cymaropyranosyl-(1- 4)-beta-D- digitoxopyranosyl-(1-4)-beta-D-thevetopyranoside and stauntogenin 3-O-alpha-L-cymaropyranosyl-(1-4)-beta-D-digitoxopyranosyl-( 1-4)-beta-D-3- demethyl-2-deoxy-thevetopyranoside.
authors.affiliation: Department of Food Science, Rutgers, State University of New Jersey, New Brunswick 08901-8520, USA.
authors.forename: N
authors.initials: N
authors.lastname: Zhu
authors.forename: M
authors.initials: M
authors.lastname: Wang
authors.forename: H
authors.initials: H
authors.lastname: Kikuzaki
authors.forename: N
authors.initials: N
authors.lastname: Nakatani
authors.forename: C T
authors.initials: CT
authors.lastname: Ho
mesh_terms: D002236:Carbohydrate Conformation; D002240:Carbohydrate Sequence; D002681:China; D008958:Models, Molecular; D008968:Molecular Conformation; D008969:Molecular Sequence Data; D018517:Plant Roots / Q000737:chemistry; D010946:Plants, Medicinal; D012503:Saponins / Q000737:chemistry* / Q000302:isolation & purification; D016339:Spectrometry, Mass, Fast Atom Bombardment; D013256:Steroids
chemical_list: D012503:Saponins; D013256:Steroids; C404166:stauntoside A; C404167:stauntoside B