title: Chemical constituents of the gentianaceae V: tetraoxygenated xanthones of Swertia chirata Buch.-Ham.
mesh_terms: D002845:Chromatography; D003460:Crystallization; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D010100:Oxygen; D010936:Plant Extracts / Q000032:analysis; D010946:Plants, Medicinal; D012996:Solutions; D013055:Spectrophotometry, Infrared; D013056:Spectrophotometry, Ultraviolet; D014970:Xanthines / Q000302:isolation & purification*
chemical_list: D010936:Plant Extracts; D012996:Solutions; D014970:Xanthines; D010100:Oxygen