This chemical is widely used in the field of bioconjugation and drug delivery systems. It serves as a key intermediate for attaching polyethylene glycol (PEG) chains to various molecules, enhancing their solubility, stability, and biocompatibility. It is particularly valuable in the development of PEGylated pharmaceuticals, where it helps improve the pharmacokinetics and reduce immunogenicity of therapeutic proteins and peptides. Additionally, it is utilized in the synthesis of advanced materials for targeted drug delivery, ensuring controlled release and improved efficacy of active pharmaceutical ingredients. Its t-butyl ester group provides protection during chemical reactions, allowing for selective modifications in complex synthetic processes.