Abstract
Pieris napi oleracea, an indigenous butterfly to North America lays eggs on Alliaria petiolata, an invasive weed introduced from Europe, but the larvae generally do not survive. A new apigenin glycoside, isovitexin 6″- O-glucoside has been isolated from the leaves A. petiolata and identified as a feeding deterrent for P. napi fourth instar larvae. The structure was elucidated by UV, MS and NMR spectroscopy.
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