Bis-PEG3-t-butyl ester is widely used in the field of bioconjugation and drug delivery. It serves as a linker molecule, enabling the attachment of various biomolecules or drugs to larger carriers, such as antibodies or nanoparticles. This chemical is particularly valuable in the development of antibody-drug conjugates (ADCs), where it helps in connecting cytotoxic drugs to antibodies, ensuring targeted delivery to cancer cells while minimizing damage to healthy tissues. Additionally, it is utilized in the synthesis of polyethylene glycol (PEG) derivatives, which are essential for improving the solubility, stability, and bioavailability of therapeutic compounds. Its t-butyl ester group provides protection during chemical reactions, allowing for controlled and efficient synthesis processes.