Used in bioconjugation and chemical biology, it serves as a linker or spacer in the synthesis of peptide and protein conjugates. The compound is particularly valuable in creating stable oxime bonds, which are essential for attaching biomolecules to surfaces or other molecules. Its PEG4 spacer enhances solubility and reduces steric hindrance, making it ideal for applications in drug delivery systems, diagnostic assays, and targeted therapies. The Boc group provides temporary protection during synthesis, while the Tos groups can be selectively removed or modified for further functionalization. This chemical is widely utilized in the development of antibody-drug conjugates (ADCs) and other biopharmaceuticals, where precise and stable linkages are crucial.