Used extensively in bioconjugation and chemical synthesis, this compound serves as a versatile linker for attaching biomolecules, such as peptides, proteins, and antibodies, to various substrates. Its propargyl group enables click chemistry reactions, particularly copper-catalyzed azide-alkyne cycloaddition, which is highly efficient and selective. The PEG6 spacer enhances solubility and reduces steric hindrance, making it ideal for applications in drug delivery systems, where it helps improve the pharmacokinetics and bioavailability of therapeutic agents. Additionally, it is employed in the development of diagnostic tools and biosensors, facilitating the precise labeling and detection of target molecules in complex biological samples. Its mesylate group allows for further functionalization, expanding its utility in creating tailored molecular constructs for research and therapeutic purposes.