Used extensively in bioconjugation and drug delivery systems, it serves as a linker to improve the solubility and stability of therapeutic compounds. Its hydrophilic PEG chains enhance biocompatibility, making it valuable in targeted cancer therapies and antibody-drug conjugates. Additionally, it is employed in surface modification of nanoparticles to prolong circulation time in the bloodstream. Its application also extends to proteomics research, where it aids in labeling and tracking biomolecules.