title: [Isolation and identification of four new tetracyclic-atxanes from Taxus yunnanensis].
abstract: Four new minor toxoids, named as taxayuntin A, B, C and D, have been isolated from the ethanolic extract of the bark of Taxus yunnanensis Cheng et L. K. Fu. Their structures were identified as the new taxane diterpenoids with 5/7/6/4 membered ring system by spectral means and 2D NMR shift correlation experiments.
authors.affiliation: Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050.
authors.forename: W M
authors.initials: WM
authors.lastname: Chen
authors.forename: P L
authors.initials: PL
authors.lastname: Zhang
authors.forename: J Y
authors.initials: JY
authors.lastname: Zhou
authors.forename: Q C
authors.initials: QC
authors.lastname: Fang
mesh_terms: D004224:Diterpenes / Q000737:chemistry / Q000302:isolation & purification*; D004365:Drugs, Chinese Herbal / Q000737:chemistry*; D015394:Molecular Structure; D010946:Plants, Medicinal; D020946:Taxus / Q000737:chemistry*
chemical_list: D004224:Diterpenes; D004365:Drugs, Chinese Herbal