Used as a linker in bioconjugation, it connects biomolecules like proteins or peptides to other entities, enhancing drug delivery systems. Its PEG (polyethylene glycol) component improves solubility and stability, reducing immunogenicity in therapeutic applications. Commonly employed in antibody-drug conjugates (ADCs) and targeted therapies, it ensures controlled release and precise targeting of drugs to specific cells or tissues. Also utilized in diagnostic imaging agents to improve biocompatibility and prolong circulation time in the body.