Used in bioconjugation and drug delivery systems, it serves as a linker to attach therapeutic molecules or targeting agents to nanoparticles or proteins. Its polyethylene glycol (PEG) chain enhances solubility and reduces immunogenicity, making it valuable in developing biocompatible and stable formulations. Commonly applied in antibody-drug conjugates (ADCs) and targeted cancer therapies, it improves the pharmacokinetics and efficacy of therapeutic compounds. Additionally, it is utilized in chemical biology for modifying peptides, proteins, or other biomolecules to study their function or enhance their stability.