long chain of the aphid alarm pheromone (E)-β-farnesene (EβF) into the polar acylpiperidine group of the commercial insect repellent icaridine based on the binding cavity characteristics of an OBP of the pea aphid Acyrthosiphon pisum, ApisOBP3. Compound 14c displayed good repellent activity against the pea aphids with a repellence rate of 61.5% at a concentration of 6 μg/μL. The equilibrium dissociation