title: A new chalcone, xanthones, and a xanthonolignoid from Hypericum geminiflorum.
abstract: A new prenyl chalcone, gemichalcone C (1), was isolated from the heartwood and root of Hypericum geminiflorum. Three new xanthones-6, 7-dihyroxy-1,3-dimethoxyxanthone (2), 4-hydroxy-1, 2-dimethoxyxanthone (3), and gemixanthone A (4)-and four known xanthones were isolated from the leaves and stems of the same plant.
authors.affiliation: School of Pharmacy, Kaohsiung Medical College, Kaohsiung, Taiwan 807, Republic of China. meinch@cc.kmc.edu.tw
authors.forename: M I
authors.initials: MI
authors.lastname: Chung
authors.forename: J R
authors.initials: JR
authors.lastname: Weng
authors.forename: M H
authors.initials: MH
authors.lastname: Lai
authors.forename: M H
authors.initials: MH
authors.lastname: Yen
authors.forename: C N
authors.initials: CN
authors.lastname: Lin
mesh_terms: D002240:Carbohydrate Sequence; D002599:Chalcone / Q000031:analogs & derivatives* / Q000737:chemistry / Q000302:isolation & purification; D002681:China; D020448:Ericales / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D008969:Molecular Sequence Data; D018515:Plant Leaves / Q000737:chemistry; D018547:Plant Stems / Q000737:chemistry; D016339:Spectrometry, Mass, Fast Atom Bombardment; D013056:Spectrophotometry, Ultraviolet; D013729:Terpenes / Q000737:chemistry / Q000302:isolation & purification*; D014966:Xanthenes / Q000737:chemistry / Q000302:isolation & purification*; D044004:Xanthones
chemical_list: C121580:4-hydroxy-1,2-dimethoxyxanthone; C121579:6,7-dihydroxy-1,3-dimethoxyxanthone; D013729:Terpenes; D014966:Xanthenes; D044004:Xanthones; C121581:gemichalone C; D002599:Chalcone