This compound is widely used in the field of bioconjugation, particularly for modifying proteins, peptides, and other biomolecules. Its primary application involves attaching polyethylene glycol (PEG) chains to therapeutic proteins to enhance their stability, solubility, and circulation time in the body. This process, known as PEGylation, helps reduce immunogenicity and prevents rapid clearance by the immune system, making it valuable in drug delivery systems. It is also utilized in the development of antibody-drug conjugates (ADCs) and other targeted therapies, where it serves as a linker to connect drugs to antibodies or other targeting molecules. Additionally, it finds use in research applications for labeling biomolecules to study their interactions and functions in biological systems.