Used in bioconjugation and protein modification, it serves as a linker molecule to attach functional groups or labels to biomolecules. Its PEG4 spacer enhances solubility and reduces steric hindrance, making it ideal for creating stable conjugates in drug delivery systems. It is also applied in the development of antibody-drug conjugates (ADCs) and targeted therapies, improving the pharmacokinetics and efficacy of therapeutic agents. Additionally, it is utilized in research for studying protein interactions and cellular processes.