title: A new C-10 acetylene and A new triterpenoid from Conyza canadensis.
abstract: From the whole plants of Conyza canadensis (Compositae), a new C-10 acetylene, namely 8R, 9R-dihydroxymatricarine methyl ester (1), and a new triterpenoid, namely 3beta, 16beta, 20beta-trihydroxytaraxast-3-O-palmitoxyl ester (4), were isolated along with eleven known compounds (2, 3, 5-13). The structures of all 13 compounds were elucidated on the basis of their spectral data. The antibacterial activities of compounds 1-3 were evaluated.
authors.affiliation: State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, P.R. China.
authors.forename: Wei Dong
authors.initials: WD
authors.lastname: Xie
authors.forename: Xue
authors.initials: X
authors.lastname: Gao
authors.forename: Zhong Jian
authors.initials: ZJ
authors.lastname: Jia
mesh_terms: D000480:Alkynes / Q000737:chemistry / Q000302:isolation & purification*; D035401:Conyza / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D014315:Triterpenes / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: D000480:Alkynes; D014315:Triterpenes