This chemical is widely utilized in the field of bioconjugation and drug delivery systems. Its structure, featuring a methoxycarbonyl group and a PEG (polyethylene glycol) spacer, makes it highly effective in modifying biomolecules to enhance their solubility, stability, and biocompatibility. It is often employed in the synthesis of peptide and protein conjugates, where it helps in improving pharmacokinetic properties and reducing immunogenicity. Additionally, it serves as a key intermediate in the development of prodrugs, enabling controlled release of active pharmaceutical ingredients. The t-butyl ester group provides protection during synthetic processes, ensuring selective reactivity in complex chemical environments. Its applications are particularly significant in targeted cancer therapies and advanced biopharmaceutical formulations.