Two new 1,3,5,6,7-pentaoxygenated xanthones from Canscora decussata |
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| Authors: | Shibnath Ghosal Kanika Biswas |
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| Affiliation: | Pharmaceutical Chemistry Research Laboratory, Department of Pharmaceutics, Banaras Hindu University, Varanasi-5, India |
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| Abstract: | One new pentaoxygenated free xanthone and a new pentaoxygenated xanthone-O-glucoside have been isolated and characterized from the flowering top of a fresh batch of Canscora decussata. The structure previously assigned to ‘xanthone 9’ has now been confirmed by application of NOE. The biochemical significance of xanthone formation and glucosidation in plants is appraised. |
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| Keywords: | Gentianaceae 1,5,7-trimetboxy-3,6-dihydroxyxanthone 5-glucosyloxy-1,6-dihydroxy-3,7-dimethoxyxanthone NOE of hydroxy-methoxyxanthones ontogenic variation of xanthones. |
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