title: Rearranged taxoids from Taxus yunnanensis.
abstract: Two rearranged 2(3-->20)abeotaxanes were isolated from the leaves and stems of Taxus yunnanensis, and designated as taxin B and 2-deacetyltaxin B. The structure of taxin B with a unique 6/10/6 skeleton was deduced on the basis of 1H-NMR, 13C-NMR, 1H-1H COSY, DEPT, NOE, and mass spectra and confirmed by X-ray crystallographic analysis. The structure of 2-deacetyltaxin B is elucidated by analog.
mesh_terms: D000470:Alkaloids / Q000737:chemistry* / Q000302:isolation & purification; D018360:Crystallography, X-Ray; D009682:Magnetic Resonance Spectroscopy; D008958:Models, Molecular; D008968:Molecular Conformation; D017239:Paclitaxel / Q000031:analogs & derivatives*; D010936:Plant Extracts; D018515:Plant Leaves; D018547:Plant Stems; D010946:Plants, Medicinal; D016339:Spectrometry, Mass, Fast Atom Bombardment; D013329:Structure-Activity Relationship
chemical_list: D000470:Alkaloids; D010936:Plant Extracts; D017239:Paclitaxel