APN-C3-PEG4-alkyne is widely used in bioconjugation and click chemistry applications due to its alkyne functional group, which enables efficient and selective reactions with azides. It is particularly valuable in the development of bioconjugates for targeted drug delivery systems, where it facilitates the attachment of therapeutic agents to antibodies or other targeting molecules. Additionally, it is employed in the synthesis of peptide-based probes and imaging agents, enhancing their stability and solubility through the PEG4 linker. This compound is also utilized in materials science for surface modification and functionalization of nanomaterials, enabling the creation of advanced biomaterials with tailored properties. Its versatility makes it a key tool in research and development across biotechnology, pharmaceuticals, and nanotechnology.