T-Butoxycarbonyl-peg5-sulfonic acid is widely used in the field of bioconjugation and chemical synthesis. It serves as a key reagent for modifying peptides, proteins, and other biomolecules due to its PEG (polyethylene glycol) spacer, which enhances solubility and biocompatibility. The t-butoxycarbonyl (Boc) group acts as a protective group for amines during synthetic processes, allowing selective reactions to occur without interference. This compound is particularly valuable in drug delivery systems, where it helps improve the pharmacokinetic properties of therapeutic agents by increasing their stability and circulation time in the body. Additionally, it is employed in the development of diagnostic agents and targeted therapies, where its sulfonic acid group facilitates conjugation to various substrates. Its versatility makes it a crucial tool in advancing biomedical research and therapeutic applications.