Used as a key intermediate in the synthesis of antibody-drug conjugates (ADCs), particularly for linking cytotoxic agents to monoclonal antibodies. Its structure enables stable, controlled conjugation through active ester chemistry, facilitating targeted delivery of potent anticancer drugs to tumor cells. The hydroxyl and carboxylic acid functionalities allow for modular derivatization, making it valuable in bioconjugation strategies that require high selectivity and plasma stability. Commonly employed in the development of oncology therapeutics where precise drug release and minimal off-target toxicity are critical.