title: Xanthones from stems of Hypericum chinense.
abstract: Six new xanthones, 4,6-dihydroxy-2,3-dimethoxyxanthone (1), 2,6-dihydroxy-3,4-dimethoxyxanthone (2), 6-hydroxy-2,3,4-trimethoxyxanthone (3), 3,6-dihydroxy-1,2-dimethoxyxanthone (4), 4,7-dihydroxy-2,3-dimethoxyxanthone (5), and 3,7-dihydroxy-2,4-dimethoxyxanthone (6) were isolated from the stems of Hypericum chinense, together with four known xanthones. Their structures were established based on spectroscopic studies.
authors.affiliation: Graduate School of Pharmaceutical Sciences, University of Tokushima. Shomachi, Tokushima, Japan.
authors.forename: Naonobu
authors.initials: N
authors.lastname: Tanaka
authors.forename: Yoshihisa
authors.initials: Y
authors.lastname: Takaishi
mesh_terms: D002851:Chromatography, High Pressure Liquid; D020902:Hypericum / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D018547:Plant Stems / Q000737:chemistry*; D013055:Spectrophotometry, Infrared; D044004:Xanthones / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: D044004:Xanthones