Migdolus fryans

The female produced long range sex pheromone of Migdolus fryans is AT-[(2 S)-2-methylbutyl]-(2S)-2-methylbutyramide 185 [345]. The acyl part as well as the alkyl part may be derived from isoleucine. Interestingly, this amide is accompanied by the ethyl ester of N-formyl isoleucine, which is also known from the scarab beetle, Phyllophaga elenans [181]. This amino acid derivative proved to be not attractive for both species its biological significance remains to be clarified. 

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