title: Taxane diterpenoids from Taxus yunnanensis and Taxus cuspidata.
abstract: Chemical examination of the seeds of the Chinese yew, Taxus runnanensis Cheng et L. K. Fu and the Japanese yew, Taxus cuspidata Sieb et Zucc, resulted in the isolation of four taxane diterpenoids. The structures of these taxoids were established as (12alpha)-2alpha-acetoxy-5alpha,9alpha, 10beta-trihydroxy-3,11-cyclotax-4(20)-en-13-one; 2alpha,7beta,13alpha-triacetoxy-5alpha, 9alpha-dihydroxy-2(3-->20)abeotaxa-4(20),11-dien-10-one; 9alpha,10beta-diacetoxy-5alpha-cinnamoyloxytaxa- 4(20),11-dien-13alpha-ol and the known 2alpha,7beta,9alpha,10beta,13-pentaacetoxytax a-4(20),12-diene-5alpha,11beta-diol on the basis of spectral analysis.
authors.affiliation: Division of Life Science, Graduate School of Agricultural Sciences, Tohoku University, Sendai, Japan.
authors.forename: Q W
authors.initials: QW
authors.lastname: Shi
authors.forename: T
authors.initials: T
authors.lastname: Oritani
authors.forename: H
authors.initials: H
authors.lastname: Kiyota
authors.forename: D
authors.initials: D
authors.lastname: Zhao
mesh_terms: D004224:Diterpenes / Q000737:chemistry / Q000302:isolation & purification*; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D017239:Paclitaxel / Q000031:analogs & derivatives; D016339:Spectrometry, Mass, Fast Atom Bombardment; D014197:Trees / Q000737:chemistry*
chemical_list: D004224:Diterpenes; D017239:Paclitaxel