title: The sesquiterpenes from the roots of Cacalia roborowskii.
abstract: A new sesquiterpene cacaroborin (1) was isolated from the roots of Cacalia roborowskii, together with three known ones, cinalbicol (2), isopetasin (3), and 3alpha-angeloyloxylactone (4). The structure of compound 1 was elucidated as 1beta,10alpha-dihydroxy-8alpha-methoxyeremophil-7(11)-en-8beta,12-olide on the basis of spectral evidence (1D, 2D NMR, IR, EI-MS, and HR-ESI-MS) and X-ray diffraction analysis.
authors.affiliation: School of Pharmacy, Lanzhou University, Lanzhou, China.
authors.forename: Zhan-Xin
authors.initials: ZX
authors.lastname: Zhang
authors.forename: Dong-Qing
authors.initials: DQ
authors.lastname: Fei
mesh_terms: D019659:Asteraceae / Q000737:chemistry*; D018360:Crystallography, X-Ray; D004365:Drugs, Chinese Herbal / Q000737:chemistry / Q000302:isolation & purification*; D008968:Molecular Conformation; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D018517:Plant Roots / Q000737:chemistry; D012717:Sesquiterpenes / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: D004365:Drugs, Chinese Herbal; D012717:Sesquiterpenes; C547999:cacaroborin