Abstract

Hyptolide belongs to a relevant group of cytotoxic compounds which occur in several members of the Lamiaceae family [1]. The conformational analysis of this highly flexible polyacylated-6-heptenyl-5,6-dihydro-2H-pyran-2-one was ascertained by a molecular modeling protocol which includes extensive systematic conformational searching [2], geometry optimization by DFT B3LYP/DGDZVP calculations, and comparison between the theoretical (DFT-GIAO) and experimental 1H-1H NMR couplings [3]. For the 28 more stable conformations, the root mean square difference between the observed and calculated couplings was smaller than 1Hz assuring the accuracy of the models.

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