title: Homocyclotirucallane and two dihydrophenanthrenes from Spiranthes sinensis.
abstract: A novel homocyclotirucallane, sinetirucallol (1), and two additional new dihydrophenanthrenes, sinensols G (2) and H (3), were isolated from the aerial parts of Spiranthes sinensis (Pers.) Ames. Their structures were determined by various spectral analyses, including MS and two-dimentional nuclear magnetic resonance techniques. The structure of compound 1 was further confirmed by single-crystal X-ray analysis. The absolute configuration of 1 was determined by modified Mosher's method.
authors.affiliation: National Research Institute of Chinese Medicine, Taipei, Taiwan. yllin@cma23.nricm.edu.tw
authors.forename: Y L
authors.initials: YL
authors.lastname: Lin
authors.forename: W Y
authors.initials: WY
authors.lastname: Wang
authors.forename: Y H
authors.initials: YH
authors.lastname: Kuo
authors.forename: Y H
authors.initials: YH
authors.lastname: Liu
mesh_terms: D000107:Acetylation; D018360:Crystallography, X-Ray; D009682:Magnetic Resonance Spectroscopy; D008958:Models, Molecular; D029595:Orchidaceae / Q000737:chemistry*; D010616:Phenanthrenes / Q000737:chemistry* / Q000302:isolation & purification; D018515:Plant Leaves / Q000737:chemistry; D013055:Spectrophotometry, Infrared; D013256:Steroids / Q000737:chemistry* / Q000302:isolation & purification
chemical_list: D010616:Phenanthrenes; D013256:Steroids; C446961:sinensol G; C446960:sinensol H; C446959:sinetirucallol