Used primarily as a reactive intermediate in organic synthesis, particularly in the production of high-performance polymers and resins. It serves as a key building block in the manufacture of epoxy curing agents, contributing to enhanced thermal stability and mechanical strength in cured epoxy systems. Also employed in the development of specialty coatings and adhesives where resistance to heat and chemicals is required. Its cyclic anhydride structure allows for efficient cross-linking, making it valuable in composite materials for aerospace and electronics applications.