title: Micranoic acids A and B: two new octanortriterpenoids from Schisandra micrantha.
abstract: Two novel octanortriterpenoids, micranoic acids A (1) and B (2), along with three known compounds, kadsuric acid (3), 3beta-hydroxy-lanost-9(11),24(25)-dien-26-oic acid (4) and schizandronic acid (5), were isolated from the leaves and stems of Schisandra micrantha. The structures of 1 and 2 were determined by 1D and 2D NMR spectroscopic analysis. Micranoic acids A and B represent a new group of triterpenes in which the entire C-17 side chain has lost. This is the first report of octanortriterpenoids isolated from the family Schisandraceae.
authors.affiliation: State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, PR China.
authors.forename: Rong-Tao
authors.initials: RT
authors.lastname: Li
authors.forename: Quan-Bin
authors.initials: QB
authors.lastname: Han
authors.forename: Ai-Hua
authors.initials: AH
authors.lastname: Zhao
authors.forename: Han-Dong
authors.initials: HD
authors.lastname: Sun
mesh_terms: D004365:Drugs, Chinese Herbal / Q000737:chemistry / Q000302:isolation & purification; D018515:Plant Leaves; D018547:Plant Stems; D032141:Schisandra; D014315:Triterpenes / Q000737:chemistry* / Q000302:isolation & purification*
chemical_list: D004365:Drugs, Chinese Herbal; D014315:Triterpenes