Used extensively in bioconjugation and click chemistry, this compound serves as a linker for attaching biomolecules, such as peptides, proteins, or antibodies, to various surfaces or other molecules. Its PEG4 spacer enhances solubility and reduces steric hindrance, making it ideal for applications in drug delivery systems and targeted therapies. The T-Boc protecting group ensures selective deprotection during synthesis, enabling precise control over conjugation processes. It is also employed in the development of diagnostic tools, biosensors, and imaging agents, where stable and efficient molecular labeling is required. Additionally, its tosylate group facilitates further functionalization, expanding its utility in organic and medicinal chemistry research.