(3Z)-3-Hexenoic acid, (2E)-2-hexenyl ester acts as a semiochemical that attracts various insects. Specifically, it is a key component of the sex pheromone of the tea-leaf roller moth, Caloptilia theivora. By using this pheromone, scientists can monitor and control populations of this agricultural pest, which causes significant damage to tea plants by rolling and feeding on young leaves.