title: New phenolic principles from Hypericum sampsonii.
abstract: Using the anti-hepatitis B virus (HBV)-producing cell line MS-G2 in vitro cultural system-guided screening was performed, and two new benzophenones, 2,6-dihydroxy-4-[(E)-5-hydroxy-3,7-dimethylocta-2,7-dienyloxy]benzophenone (1) and 2,6-dihydroxy-4-[(E)-7-hydroxy-3,7-dimethylocta-2-enyloxy]benzophenone (2), a new xanthone, hyperxanthone (3), a new bisanthraquinone glycoside, R-(-)-skyrin-6-O-beta-D-xylopyranoside (4), and 2-caffeoyloxy-3-hydroxy-3-(3,4-dihydroxyphenyl)propyl alcohol (5), and 16 known compounds were isolated from the anti-HBV active fraction of the whole herbs of Hypericum sampsonii. Their structures were elucidated using spectroscopic methods, mainly 2D NMR and MS spectrometry. Circular dichroism was used to determine the stereochemistry of bisanthraquinone glycosides.
authors.affiliation: National Research Institute of Chinese Medicine, Taipei, Taiwan.
authors.forename: Ming-Jaw
authors.initials: MJ
authors.lastname: Don
authors.forename: Yeh-Jeng
authors.initials: YJ
authors.lastname: Huang
authors.forename: Ray-Ling
authors.initials: RL
authors.lastname: Huang
authors.forename: Yun-Lian
authors.initials: YL
authors.lastname: Lin
mesh_terms: D020902:Hypericum; D010636:Phenols / Q000737:chemistry* / Q000302:isolation & purification; D010936:Plant Extracts / Q000737:chemistry / Q000302:isolation & purification; D028321:Plant Preparations / Q000737:chemistry* / Q000302:isolation & purification
chemical_list: D010636:Phenols; D010936:Plant Extracts; D028321:Plant Preparations