Five compounds, 1 − 5, were isolated from the seed hexane extract of Dirca palustris . Compounds 1 − 3 were triglycerides, and 4 and 5 were linoleic and oleic acids, respectively. Compounds 1 − 3 were not biologically active; however, 4 (linoleic acid) and 5 (oleic acid) were insecticidal against fourth instar Aedes aegyptii larvae and exhibited potent feeding deterrent activity against neonate larvae of Helicoverpa zea, Lymantria dispar, Orgyia leucostigma, and Malacosoma disstria .
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Ramsewak et al. (2001) studied this question.
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