title: [Chemical constituents of Swertia tetraptera Maxim. var. xinglongensis Ji Ma et R. N. Zhao].
abstract: Five natural products were isolated from S. tetraptera var. xinglongensis of which four were proved to be oleanolic acid, 1,3-dihydroxy-4,7-dimethoxyxanthone, 1-hydroxy-2,3,5-trimethoxyxanthone and beta-sitosterol. 1,3-dihydroxy-4,7-dimethoxyxanthone has been obtained for the first time from the genus Swertia.
authors.affiliation: Department of Chemistry, Lanxhou Medical College.
authors.forename: B
authors.initials: B
authors.lastname: Niu
authors.forename: J
authors.initials: J
authors.lastname: Guo
authors.forename: J
authors.initials: J
authors.lastname: Chen
authors.forename: J
authors.initials: J
authors.lastname: Ma
mesh_terms: D004365:Drugs, Chinese Herbal / Q000737:chemistry*; D009828:Oleanolic Acid / Q000302:isolation & purification; D012855:Sitosterols / Q000302:isolation & purification; D014966:Xanthenes; D044004:Xanthones
chemical_list: C478004:1-hydroxy-2,3,5-trimethoxyxanthone; D004365:Drugs, Chinese Herbal; D012855:Sitosterols; D014966:Xanthenes; D044004:Xanthones; C073945:1,3-dihydroxy-4,7-dimethoxy-xanthone; C025473:gamma-sitosterol; D009828:Oleanolic Acid