title: Sesquiterpenes, nortriterpenes and other constituents from Ligularia tongolensis.
abstract: Two new eremophilane-type sesquiterpenes, 3beta-(2'-methylbutanoyloxy)-8betaH-eremophil-7(11)-ene-12,8alpha-(14,6alpha)-diolide (1) and 8betaH-eremophil-3,7(11)-diene-12,8alpha(14,6alpha)-diolide (2), and two new norursane-type triterpenes, 2alpha,3beta,19alpha-trihydroxy-28-norurs-12-ene (7) and 2alpha,3alpha,19alpha-trihydroxy-28-norurs-12-ene (8), were isolated from the roots of Ligularia tongolensis, together with nine known compounds. The structures of the new compounds were elucidated by spectroscopic methods.
authors.affiliation: State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, PR China.
authors.forename: Yi Feng
authors.initials: YF
authors.lastname: Han
authors.forename: Jing
authors.initials: J
authors.lastname: Pan
authors.forename: Kun
authors.initials: K
authors.lastname: Gao
authors.forename: Zhong Jian
authors.initials: ZJ
authors.lastname: Jia
mesh_terms: D019659:Asteraceae / Q000737:chemistry* / Q000145:classification; D002247:Carbon Isotopes; D004353:Drug Evaluation, Preclinical; D009682:Magnetic Resonance Spectroscopy / Q000379:methods / Q000592:standards; D008968:Molecular Conformation; D018517:Plant Roots / Q000737:chemistry; D011522:Protons; D012015:Reference Standards; D012717:Sesquiterpenes / Q000737:chemistry* / Q000302:isolation & purification; D014315:Triterpenes / Q000737:chemistry* / Q000302:isolation & purification
chemical_list: C507502:2alpha,3beta,19alpha-trihydroxy-28-norurs-12-ene; C507500:3beta-(2'-methylbutanoyloxy)-8betaH-eremophil-7(11)-ene-12,8alpha-(14,6alpha)diolide; C507501:8betaH-eremophil-3,7(11)-diene-12,8alpha(14,6alpha)diolide; D002247:Carbon Isotopes; D011522:Protons; D012717:Sesquiterpenes; D014315:Triterpenes