This chemical is primarily used in bioconjugation and drug delivery systems due to its polyethylene glycol (PEG) chains, which enhance solubility and stability of compounds. It is often employed in the development of PEGylated drugs, where it helps to prolong the circulation time of therapeutic agents in the body, reducing immunogenicity and improving efficacy. Additionally, it serves as a linker in the synthesis of targeted drug delivery systems, enabling the attachment of drugs to specific biomolecules like antibodies or peptides. Its t-butyl ester groups provide protection during chemical reactions, allowing for controlled deprotection and functionalization in complex synthetic processes.