This chemical is primarily utilized in the synthesis of complex organic molecules, particularly in the development of polyethylene glycol (PEG) derivatives. Its structure, featuring a PEG chain and a tert-butyl ester group, makes it valuable for creating biocompatible and water-soluble compounds. It is often employed in the modification of peptides, proteins, and other biomolecules to enhance their stability, solubility, and pharmacokinetic properties. Additionally, it serves as a key intermediate in the production of drug delivery systems, such as PEGylated therapeutics, which are designed to improve drug efficacy and reduce side effects. Its applications also extend to the field of bioconjugation, where it is used to attach functional groups to biomolecules for targeted therapies and diagnostic purposes.