title: Complete assignments of 1H and 13C NMR spectral data for three sesquiterpenoids from Inula helenium.
abstract: The complete assignments of all the (1)H and (13)C NMR signals of three sesquiterpene lactones, 4-oxo-5(6),11-eudesmadiene-8,12-olide (1), 4-oxo-11-eudesmaene-8,12-olide (2) and (1(10)E)-5beta-Hydroxygermacra-1(10),4(15),11-trien-8, 12-olide (3), were carried out by various 2D NMR experiments. Compounds 1-3 were isolated from the roots of Inula helenium for the first time. Among them, 1 was identified as a new nor-sesquiterpene lactone, and 2 was isolated from a natural source for the first time. The (13)C-NMR data of compound 3 was also reported for the first time.
authors.affiliation: School of Pharmacy, Shanghai Jiao Tong University, Shanghai 200240, PR China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Huo
authors.forename: Haiming
authors.initials: H
authors.lastname: Shi
authors.forename: Mengyue
authors.initials: M
authors.lastname: Wang
authors.forename: Xiaobo
authors.initials: X
authors.lastname: Li
mesh_terms: D002247:Carbon Isotopes; D038143:Inula / Q000737:chemistry*; D007783:Lactones / Q000737:chemistry; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D018517:Plant Roots; D012717:Sesquiterpenes / Q000737:chemistry*
chemical_list: D002247:Carbon Isotopes; D007783:Lactones; D012717:Sesquiterpenes