Used extensively in bioconjugation and click chemistry, it serves as a linker for attaching biomolecules like proteins, peptides, or antibodies to other functional groups or surfaces. Its PEG4 spacer enhances solubility and reduces steric hindrance, making it ideal for creating stable conjugates in drug delivery systems, diagnostic assays, and targeted therapies. The propargyl group enables efficient copper-catalyzed azide-alkyne cycloaddition (CuAAC) reactions, while the maleimide moiety allows for thiol-specific coupling, facilitating precise and versatile modifications in bioconjugation strategies.