Stereoselective synthesis of <i>trans</i>-fused iridoid lactones and their identification in the parasitoid wasp <i>Alloxysta victrix</i>, Part I: Dihydronepetalactones
also be used for the synthesis of enantiomerically pure trans-fused iridomyrmecins. Using synthetic reference samples, the combination of enantioselectivegaschromatography and mass spectrometry revealed that volatiles released by the endohyperparasitoid wasp Alloxysta victrix contain the enantiomerically pure trans-fused (4R,4aR,7R,7aS)-dihydronepetalactone as a minor component, showing an unusual