title: Complete 1H and 13C NMR assignments of sesquiterpene glucosides from Ixeris sonchifolia.
abstract: Four sesquiterpene glucosides were isolated from Ixeris sonchifolia Hance. The structure of a new compound (1) was assigned as 9beta-monohydroxy-2,12-dioxo-guaia-3,11(13)-dien-1alpha,5alpha,6beta,7alpha,9beta,10alphaH-12,6-olide-9-O-beta-D- glucopyranoside (ixerinoside). In addition, unambiguous and complete assignments of (1)H NMR chemical shifts for crepidiaside A (2), ixerin Z (3), and 11,13alpha-dihydroixerin Z (4) are presented. The assignments were achieved by two-dimensional NMR (gCOSY, gHSQC, gHMBC, NOESY) and one-dimensional nuclear Overhauser effect (NOE) experiments.
authors.affiliation: Department of Food Science and Technology and Functional Food Research Center, Chonnam National University, Gwangju 500-757, Korea.
authors.forename: ZeyEi
authors.initials: Z
authors.lastname: Na
authors.forename: Jeong-Yong
authors.initials: JY
authors.lastname: Cho
authors.forename: Hyoung Jae
authors.initials: HJ
authors.lastname: Lee
authors.forename: Jin Ho
authors.initials: JH
authors.lastname: Chung
authors.forename: Ki Deok
authors.initials: KD
authors.lastname: Park
authors.forename: Young Ju
authors.initials: YJ
authors.lastname: Lee
authors.forename: Soo Cheol
authors.initials: SC
authors.lastname: Shin
authors.forename: Yo Sup
authors.initials: YS
authors.lastname: Rim
authors.forename: Keun-Hyung
authors.initials: KH
authors.lastname: Park
authors.forename: Jae-Hak
authors.initials: JH
authors.lastname: Moon
mesh_terms: D019659:Asteraceae / Q000737:chemistry*; D002247:Carbon Isotopes; D005960:Glucosides / Q000737:chemistry* / Q000302:isolation & purification; D009682:Magnetic Resonance Spectroscopy / Q000379:methods* / Q000592:standards*; D008968:Molecular Conformation; D011522:Protons; D012015:Reference Standards; D012680:Sensitivity and Specificity; D012717:Sesquiterpenes / Q000737:chemistry* / Q000302:isolation & purification; D013237:Stereoisomerism
chemical_list: C519650:11,13-dihydroixerin Z; C519651:9-monohydroxy-2,12-dioxoguaia-3,11(13)-dien-1,5,6,7,9,10H-12,6-olide-9-O-glucopyranoside; D002247:Carbon Isotopes; D005960:Glucosides; D011522:Protons; D012717:Sesquiterpenes