Used as a linker in bioconjugation, particularly in the development of antibody-drug conjugates (ADCs) and other targeted therapies. It facilitates the attachment of drugs or other functional molecules to proteins or antibodies, enhancing their delivery to specific cells or tissues. Also employed in the synthesis of PEGylated compounds, improving solubility, stability, and bioavailability of therapeutic agents. Commonly applied in pharmaceutical research and drug delivery systems to optimize pharmacokinetics and reduce immunogenicity.