A new xanthone from Garcinia nitida |
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| Authors: | Ee G C L Foo C H Jong V Y M Ismail N H Sukari M A Taufiq Yap Y H Awang K |
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| Institution: | Department of Chemistry, Faculty of Science, University Putra Malaysia, Serdang 43400 UPM, Selangor, Malaysia. gwen@science.upm.edu.my |
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| Abstract: | A detailed chemical study on the stem bark of Garcinia nitida has led to the isolation of five xanthones. They are 1,6-dihydroxy-5-methoxy-6,6-dimethylpyrano2',3':2,3]-xanthone (1), inophyllin B (2), osajaxanthone (3), 3-isomangostin (4) and rubraxanthone (5). The structures of these compounds were established using mainly 1-D and 2-D NMR spectroscopy ((1)H, (13)C, DEPT, COSY, HMBC and HMQC) while molecular masses were determined via MS techniques; 1 is a new compound. |
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