Used as a crosslinking agent in polymer chemistry, particularly in the synthesis of biodegradable polyesters. It helps improve thermal stability and mechanical properties of polymers. Also employed in the production of plasticizers and stabilizers for PVC and other plastics. Its bifunctional carboxylic acid groups allow it to act as a building block in organic synthesis, especially in creating thioether-containing compounds. Additionally, it finds use in pharmaceutical intermediates where sulfur-containing structures are needed.