title: Structure elucidation and complete NMR spectral assignments of four new diterpenoids from Smallantus sonchifolius.
abstract: Four new diterpenoids, named smaditerpenic acid A-D, together with five known compounds, were isolated from the H(2)O extract of the leaves of Smallantus sonchifolius (yacon) cultivated in Liaoning, China and their structures were elucidated on the basis of one- and two-dimensional NMR (including (1)H, (13)C-NMR, (1)H-(1)H COSY, HSQC, TOCSY, HMBC, and ROESY), electrospray ionization mass spectrometry (ESI-MS), and chemical methods.
authors.affiliation: College of Pharmacy, Liaoning University of Traditional Chinese Medicine, DD Port, Dalian 116600, China. doudeqiang2003@yahoo.com.cn
authors.forename: De-Qiang
authors.initials: DQ
authors.lastname: Dou
authors.forename: Fang
authors.initials: F
authors.lastname: Tian
authors.forename: Ying-Kun
authors.initials: YK
authors.lastname: Qiu
authors.forename: Ting-Guo
authors.initials: TG
authors.lastname: Kang
authors.forename: Feng
authors.initials: F
authors.lastname: Dong
mesh_terms: D019659:Asteraceae / Q000737:chemistry* / Q000254:growth & development; D002681:China; D004224:Diterpenes / Q000737:chemistry / Q000302:isolation & purification*; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D018515:Plant Leaves / Q000737:chemistry; D021241:Spectrometry, Mass, Electrospray Ionization
chemical_list: D004224:Diterpenes