Used in bioconjugation and drug delivery systems, it serves as a linker molecule to connect therapeutic agents with targeting moieties, enhancing drug specificity and efficacy. Its PEG (polyethylene glycol) chains improve solubility and reduce immunogenicity, making it suitable for use in pharmaceuticals and biologics. The t-butyl ester groups provide stability during synthesis and can be cleaved under specific conditions to release active compounds. Commonly applied in the development of antibody-drug conjugates (ADCs) and targeted cancer therapies.