Used as an intermediate in the synthesis of specialty polymers and plasticizers, enhancing flexibility and durability in polymer materials. Employed in organic synthesis for constructing eight-membered ring systems, such as lactams and lactones, and long-chain dicarboxylic acid derivatives. Important in the development of pharmaceuticals and biological substances. Also applied in the development of coatings, adhesives, and lubricants due to its bifunctional reactivity, and used as a solvent or reagent in reactions requiring both ester and carboxylic acid groups in the same molecule for precise control.