title: Isolation and characterization of Brachystemidines A-E, novel alkaloids from Brachystemma calycinum.
abstract: Five novel alkaloids, brachystemidines A-E (1-5), were isolated from the roots of Brachystemma calycinum. Their structures were established by spectral data, especially by 1D and 2D NMR techniques. The crystal structure of brachystemidine D was determined via X-ray diffraction analysis.
authors.affiliation: Laboratory of Phytochemistry, Kunming Institute of Botany, The Chinese Academy of Sciences, Kunming 650204, People's Republic of China.
authors.forename: Yong-Xian
authors.initials: YX
authors.lastname: Cheng
authors.forename: Jun
authors.initials: J
authors.lastname: Zhou
authors.forename: Ning-Hua
authors.initials: NH
authors.lastname: Tan
authors.forename: Rong-Wei
authors.initials: RW
authors.lastname: Teng
authors.forename: Yang
authors.initials: Y
authors.lastname: Lu
authors.forename: Cheng
authors.initials: C
authors.lastname: Wang
authors.forename: Qi-Tai
authors.initials: QT
authors.lastname: Zheng
mesh_terms: D000470:Alkaloids / Q000737:chemistry / Q000302:isolation & purification*; D029748:Caryophyllaceae / Q000737:chemistry*; D018360:Crystallography, X-Ray; D004365:Drugs, Chinese Herbal / Q000737:chemistry*; D008968:Molecular Conformation; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D018517:Plant Roots / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry*
chemical_list: D000470:Alkaloids; D004365:Drugs, Chinese Herbal