Used primarily as an intermediate in organic synthesis, especially in the production of pharmaceuticals and fine chemicals. Its reactive acid chloride and ester functional groups allow it to participate in acylation reactions and serve as a building block for constructing complex molecules. Commonly employed in the preparation of polymers and biodegradable materials due to its ability to form long-chain aliphatic polyesters. Also utilized in the development of prodrugs, where the ester moiety can be tailored for controlled release. Its bifunctional nature makes it valuable in cross-linking agents and in the synthesis of specialty monomers for copolymerization.