title: Two new xanthones from Premna microphylla.
abstract: Two new xanthones have been isolated from the EtOAc extract of the roots of Premna microphylla Turcz. Based on spectral and chemical evidences, their structures were elucidated as 1-hydroxy-2,3-methylenedioxy-6-methoxycarbonyl-7-acetylxanthone 1 and 1,3-dihydroxy-2-methoxy-6-methoxycarbonyl-7-acetylxanthone 2. This is the first report on isolation of xanthones from this plant.
authors.affiliation: Center of Natural Product, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, P.R. China. wdingyong@yahoo.com.cn
authors.forename: Ding-Yong
authors.initials: DY
authors.lastname: Wang
authors.forename: Su-Ying
authors.initials: SY
authors.lastname: Xu
mesh_terms: D002681:China; D019906:Nuclear Magnetic Resonance, Biomolecular; D018517:Plant Roots / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry*; D021241:Spectrometry, Mass, Electrospray Ionization; D013055:Spectrophotometry, Infrared; D013056:Spectrophotometry, Ultraviolet; D029648:Verbenaceae / Q000737:chemistry*; D014966:Xanthenes / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: D014966:Xanthenes