(2E,4E,6E)-2,4,6-Nonatrienoic Acid Ethyl Ester is an unsaturated ester that is used as a reagent to synthesize pheromone compounds that are produced by the male eggplant flea beetle. These pheromones are used for further study into the mating patterns and also have potential to protect the eggplants from unwanted pests.