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The aerial part of Melanoselinum decipiens yielded, in addition to the previous known decipienin A, two sesquiterpene lactones whose structures were elucidated by spectroscopic methods. Both substances belong to a stereostructural type of eudesmanolides which is described for the first time from Umbelliferae. The stereochemistry of one of the lactones was confirmed by X-ray diffraction analysis...
Seventeen new eudesmanolides have been isolated from Melanoselinum decipiens, together with the previously known lasolide and the decipienins A, B, D and F. Relative configurations of decipienin B have been assigned by spectroscopic means.
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