Used extensively in bioconjugation and drug delivery systems, it serves as a linker or spacer molecule to enhance the solubility and stability of therapeutic compounds. Its hydrophilic polyethylene glycol (PEG) chain improves pharmacokinetics by reducing immunogenicity and prolonging circulation time in the body. Commonly applied in the development of antibody-drug conjugates (ADCs), it helps in attaching cytotoxic drugs to antibodies, ensuring targeted delivery to cancer cells. Additionally, it is utilized in modifying proteins, peptides, and nanoparticles to improve their therapeutic efficacy and reduce aggregation. Its application also extends to surface functionalization in biomedical research, where it is used to create biocompatible coatings for implants and diagnostic tools.