title: Structural determination of three new eudesmanolides from Inula helenium.
abstract: Ten sesquiterpenens were isolated from Inula helenium. Among them, three eudesmanolides: 15-hydroxy-11betaH-eudesm-4-en-8beta,12-olide (1), 3alpha-hydroxy-11betaH-eudesm-5-en-8beta,12-olide (2) and 2beta, 11alpha-dihydroxy-eudesm-5-en-8beta,12-olide (3) are new compounds. Their chemical structures were determined by spectral methods including 2D NMR.
authors.affiliation: School of Pharmaceutical Sciences, Dalian Medical University, Dalian 116027, PR China. maxc1978@sohu.com
authors.forename: Xiao-Chi
authors.initials: XC
authors.lastname: Ma
authors.forename: Ke-Xin
authors.initials: KX
authors.lastname: Liu
authors.forename: Bao-Jing
authors.initials: BJ
authors.lastname: Zhang
authors.forename: Xiu-Lan
authors.initials: XL
authors.lastname: Xin
authors.forename: Jian
authors.initials: J
authors.lastname: Huang