Used in bioconjugation and drug delivery systems, this compound serves as a linker to connect biomolecules or drugs with other functional groups. Its alkyne group enables click chemistry reactions, particularly with azides, for efficient and selective coupling. The PEG3 spacer enhances solubility and reduces steric hindrance, improving the stability and bioavailability of the resulting conjugates. The carboxyl group allows further functionalization, making it versatile for attaching targeting ligands or other molecules in pharmaceutical and biomedical research.