Used as a key intermediate in the synthesis of pharmaceuticals and fine chemicals, particularly in the development of drugs requiring thiol-functionalized aromatic structures. Its carboxylic acid and thiol groups allow for dual functionalization, making it valuable in conjugation reactions, such as linking payloads in antibody-drug conjugates (ADCs) or building blocks in peptide mimetics. Also employed in polymer chemistry to introduce reactive thiol groups into aromatic backbones for crosslinking or surface modification. Additionally, serves as a ligand or modifier in catalysis and material science due to its ability to bind metals through the sulfhydryl group.