Used in bioconjugation and drug delivery systems, it acts as a linker to attach therapeutic molecules or targeting ligands to nanoparticles or proteins. Its PEG component enhances solubility and reduces immunogenicity, while the t-butyl ester group provides stability during synthesis and can be removed under specific conditions for further functionalization. Commonly applied in the development of targeted cancer therapies, it helps improve the pharmacokinetics and bioavailability of drugs. Additionally, it is utilized in surface modification of materials to enhance biocompatibility for biomedical applications.