title: Structure characterization and possible biogenesis of three new families of nortriterpenoids: schisanartane, schiartane, and 18-norschiartane.
abstract: Four new, highly oxygenated nortriterpenoids with unique schisanartane skeletons, micrandilactones D-G (1-4), have been isolated from the leaves and stems of Schisandra micrantha, and their structures have been elucidated on the basis of extensive spectral studies. The postulated biogenetic sequences of sixteen highly oxygenated nortriterpenoids and bisnortriterpenoids with new skeletons from three Schisandra species are discussed and have been compared from a chemotaxonomic standpoint.
authors.affiliation: State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650204, P.R. China.
authors.forename: Rong-Tao
authors.initials: RT
authors.lastname: Li
authors.forename: Wei-Lie
authors.initials: WL
authors.lastname: Xiao
authors.forename: Yun-Heng
authors.initials: YH
authors.lastname: Shen
authors.forename: Qin-Shi
authors.initials: QS
authors.lastname: Zhao
authors.forename: Han-Dong
authors.initials: HD
authors.lastname: Sun
mesh_terms: D007783:Lactones / Q000737:chemistry; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D032141:Schisandra / Q000737:chemistry / Q000378:metabolism; D014315:Triterpenes / Q000737:chemistry* / Q000145:classification / Q000378:metabolism*
chemical_list: C512129:18-norschiartane; D007783:Lactones; D014315:Triterpenes; C512130:schiartane; C512131:schisanartane