Used primarily in bioconjugation and drug delivery systems, this compound serves as a linker for attaching biomolecules such as proteins, peptides, or antibodies to other entities like nanoparticles or drug carriers. Its pyridyldithio group enables reversible disulfide bond formation, which is useful for controlled release applications in targeted therapies. The PEG4 spacer enhances solubility and reduces steric hindrance, improving the efficiency of molecular interactions. It is also employed in the development of diagnostic assays and therapeutic agents, where precise and stable conjugation is critical. Additionally, it finds use in surface modification of materials for biomedical applications, ensuring biocompatibility and functionalization.