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A New Pyrano Xanthone from the Stem Barks of Garcinia tetrandra Pierre

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In a search of bioactive constituents from Guttiferae plants, we have isolated, purified by combining chromatography methods (Gravitation column chromatography, flash column chromatography and preparative chromatography) and elucidated a new pyrano xanthone tetrandraxanthone [1,3-dihydroxy,2`,2`-dimethyl pyrano (5`,6`,5,6) xanthone] (1) and seven known compounds cudraxanthone (2), lupeol (3), stigmasterol (4), thawaitesixanthone (5), 3-a-hopenol (6), isophrenyl benzophenones cambogin (7) and camboginol (8) from hexane and acetone extracts of the stem barks of Garcinia tetrandra Pierre. Their structures were established by spectroscopical data, including 1-D and 2-D NMR. These compounds are the first time reported from this plant.

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