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- W2067685616 abstract "The whole plant of Swertia purpurascens Wall. (Gentianaceae) has been shown to contain five tetraoxygenated and three pentaoxygenated xanthones. These are identified as 1,5,8‐trihydroxy‐3‐methoxyxanthone, 1,3,8‐trihydroxy‐5‐methoxyxanthone, 1‐hydroxy‐3,7,8‐trimethoxyxanthone, 1,3,7,8‐tetrahydroxyxanthone, 1,3,5,8‐tetrahydroxyxanthone, and 1‐hydroxy‐3,4,7,8‐tetramethoxyxanthone by chemical and spectral evidence. Additionally, the crude mixture of natural xanthones has been shown to include two partially methylated pentaoxygenated xanthones as minor entities, which yield 1‐hydroxy‐3,4,7,8‐tetramethoxyxanthone and 1‐hydroxy‐3,4,5,8‐tetramethoxyxanthone on methylation. This is the first time that pentaoxygenated xanthones have been found in a member of the genus Swertia. 1‐Hydroxy‐3,4,7,8‐tetramethoxyxanthone was previously known only as a synthetic compound. The total xanthones of S. purpurascens produce significant CNS stimulant actions, consistent with some therapeutic uses of the plant extract in the Indian system of medicine. The chemotaxonomic significance of the cooccurrence of various biogenetically related chemical characters in a single plant species is appraised." @default.
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- W2067685616 date "1975-01-01" @default.
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- W2067685616 title "Chemical Constituents of Gentianaceae XIV: Tetraoxygenated and Pentaoxygenated Xanthones of Swertia Purpurascens Wall" @default.
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- W2067685616 doi "https://doi.org/10.1002/jps.2600640115" @default.
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