title: [Novel triterpenoids from Cynanchum hancockianum].
abstract: Four new triterpenoids have been isolated from the petroleum ether extract of Cyananchum hancockianum (Maxim) Al. Iljinski (Asclepiadaceae). On the basis of spectral data (1HNMR, 13CNMR, 1H-1H COSY, 1H-13C COSY, longrange 1H-13C COSY, MS, X-Ray analysis) and chemical connections, they were identified as hancockinol (Ia), hancolupenol (IIa), hancolupenone (IIc), and hancolupenol octacosanate (IId). They are of new skeletons with B/C cis, C/D trans, D/E cis junctures for Ia and with A/B trans, C/D trans, D/E cis junctures for IIa, IIc and IId.
authors.affiliation: Division of Natural Product Research, Shengyang College of Pharmacy.
authors.forename: H X
authors.initials: HX
authors.lastname: Lou
authors.forename: X
authors.initials: X
authors.lastname: Li
authors.forename: T R
authors.initials: TR
authors.lastname: Zhu
mesh_terms: D004365:Drugs, Chinese Herbal / Q000737:chemistry*; D008968:Molecular Conformation; D014315:Triterpenes / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: D004365:Drugs, Chinese Herbal; D014315:Triterpenes; C073852:hancockinol; C073851:hancolupenol; C073850:hancolupenone