New germacrolide- and heliangolide-type sesquiterpene lactones from Melampodium linearilobum |
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Authors: | Fred C Seaman Nikolaus H Fischer |
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Institution: | Department of Chemistry, Louisiana State University, Baton Rouge, LA 70803, U.S.A. |
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Abstract: | Chemical analysis of Melampodium linearilobum yielded, besides coumarin, seven germacrolide-type sesquiterpene lactones, linearilobin A to G and two heliangolides, linearilobin H and I. All new sesquiterpene lactones are oxygenated at C-14 and C-15 and differ by the number and types of ester moieties at C-8, C-14 and C-15. M. linearilobum represents the first species within the genus known to produce germacrolides and heliangolides instead of the more common melampolides. |
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Keywords: | Heliantheae Compositae sesquiterpene lactones germacrolides heliangolides |
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