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  • Title: cis,cis-Germacranolides and melampolides from Mikania thapsoides.
    Author: Catalán CA, Del R Cuenca M, Hernández LR, Joseph-Nathan P.
    Journal: J Nat Prod; 2003 Jul; 66(7):949-53. PubMed ID: 12880312.
    Abstract:
    The aerial parts of Mikania thapsoides afforded six new cis,cis-germacranolide-type sesquiterpene lactones (1-6), of which three (1-3) have an unusual 3,4-epoxy function, and also afforded two new melampolides (7 and 8). All compounds have a trans C-8 lactone ring closure. Their structures were elucidated using 1D and 2D NMR measurements, and the absolute configuration of 1 was determined using the Mosher ester method.
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