title: Phytochemical investigation of xanthones of Eustoma grandiflorum (Raf.) Shinners.
abstract: Six polyoxygenated xanthones were isolated from the roots of Eustoma grandiflorum (Raf.) Shinners collected in Texas. Structural elucidation of five of these xanthones (1-hydroxy-3,7-dimethoxyxanthone, 1-hydroxy-3,5-dimethoxyxanthone, 1-hydroxy-3,5,6,7-tetramethoxyxanthone, 1-hydroxy-3,5,6,7,8-pentamethoxyxanthone, and 1-hydroxy-3,7,8-trimethoxyxanthone) was accomplished via UV, IR, NMR, and mass spectrometry; traditional physical-chemical methods; or direct comparison with a prepared derivative. The sixth xanthone derivative was characterized incompletely. The pentamethoxyxanthone is a new compound and has been designated generically as eustomin. The probable occurrence of these six xanthone compounds in the plant as glycosides is reported.
mesh_terms: D055598:Chemical Phenomena; D002621:Chemistry; D002855:Chromatography, Thin Layer; D006027:Glycosides / Q000302:isolation & purification; D006868:Hydrolysis; D009682:Magnetic Resonance Spectroscopy; D010946:Plants, Medicinal / Q000032:analysis*; D014966:Xanthenes / Q000302:isolation & purification*
chemical_list: D006027:Glycosides; D014966:Xanthenes