title: Xanthones and benzophenones from Garcinia griffithii and Garcinia mangostana.
abstract: A new polyisoprenylated benzophenone, guttiferone I, together with the known compounds cambogin, 1,7-dihydroxyxanthone, 1,3,6,7-tetrahydroxyxanthone and 1,3,5,6-tetrahydroxyxanthone were isolated from the stem bark of Garcinia griffithii. The acetone extract of the heartwood of Garcinia mangostana contained one new diprenylated xanthone (mangoxanthone) and a new benzophenone (3',6-dihydroxy-2,4,4'-trimethoxybenzophenone) as well as the known xanthones dulxanthone D, 1,3,7-trihydroxy-2-methoxyxanthone, 1,3,5-trihydroxy-13,13-dimethyl-2H-pyran[7,6-b]xanthen-9-one. Their structures were established on the basis of spectroscopic studies and chemical correlation.
authors.affiliation: Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Republic of Singapore.
authors.forename: Lien-Hoa D Nilar
authors.initials: LH
authors.lastname: Nguyen
authors.forename: Ganpathi
authors.initials: G
authors.lastname: Venkatraman
authors.forename: Keng-Yeow
authors.initials: KY
authors.lastname: Sim
authors.forename: Leslie J
authors.initials: LJ
authors.lastname: Harrison
mesh_terms: D001577:Benzophenones / Q000737:chemistry* / Q000302:isolation & purification; D029760:Garcinia / Q000737:chemistry*; D029762:Garcinia mangostana / Q000737:chemistry*; D015394:Molecular Structure; D024301:Plant Bark / Q000737:chemistry; D018547:Plant Stems / Q000737:chemistry; D044004:Xanthones / Q000737:chemistry* / Q000302:isolation & purification
chemical_list: D001577:Benzophenones; D044004:Xanthones