title: Four new compounds from Imperata cylindrica.
abstract: Four new compounds, impecylone (1), deacetylimpecyloside (2), seguinoside K 4-methylether (3) and impecylenolide (4), were isolated from Imperata cylindrica along with two known compounds, impecyloside (5) and seguinoside K (6). Their structures were elucidated mainly by spectroscopic analyses including 1D- and 2D-NMR techniques, and the absolute configuration of 1 was confirmed by X-ray diffraction analysis. In calcium assay, the result indicated that compounds 1, 2, 4 and 5 cannot obviously inhibit the calcium peak value compared with the negative control, and suggested that the four compounds could not have anti-inflammatory activity.
authors.affiliation: Department of Pharmacognosy, China Pharmaceutical University, Nanjing, 210038, People's Republic of China.
authors.forename: Xuan
authors.initials: X
authors.lastname: Liu
authors.forename: Bin-Feng
authors.initials: BF
authors.lastname: Zhang
authors.forename: Li
authors.initials: L
authors.lastname: Yang
authors.forename: Gui-Xin
authors.initials: GX
authors.lastname: Chou
authors.forename: Zheng-Tao
authors.initials: ZT
authors.lastname: Wang
mesh_terms: D064209:Phytochemicals / Q000737:chemistry*; D006109:Poaceae / Q000737:chemistry*
chemical_list: D064209:Phytochemicals