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A chemical study of the leaves of the southern evergreen Magnolia virginiana provided, besides the known sesquiterpene lactones costunolide, parthenolide and trifloculoside, two new sesquiterpenes, costunolact-12β-ol and its acetal dimer. The molecular structure of the acetal dimer of costunolact-12β-ol was determined by single crystal X-ray diffraction. An annual study of the relative ratios of...
Fungicidal activity of 36 natural and synthetic sesquiterpene lactones with guaianolide, trans, trans-germacranolide, cis, cis-germacranolide, melampolide, and eudesmanolide carbon skeletons was evaluated against the phytopathogenic fungi Colletotrichum acutatum, C. fragariae, C. gloeosporioides, Fusarium oxysporum, Botrytis cinerea, and Phomopsis sp. Dose-response data for the active compounds dehydrozaluzanin...
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