Used in the synthesis of antibody-drug conjugates (ADCs) as a linker component, enabling controlled release of cytotoxic agents in targeted cancer therapies. Its disulfide bond provides redox sensitivity, allowing drug release in the reducing environment of cancer cells. Also employed in bioconjugation techniques for labeling proteins and antibodies due to its selective reactivity with thiol groups. Suitable for constructing prodrugs and functionalized polymers in pharmaceutical research.