Used as a bifunctional linker in bioconjugation and pharmaceutical synthesis, particularly in the preparation of antibody-drug conjugates (ADCs) and PEGylated compounds. The tert-butyl carbamate (Boc) group provides a protected amine that can be selectively deprotected under mild acidic conditions, allowing for controlled coupling to biomolecules. The terminal alkyne enables efficient conjugation via copper-catalyzed azide-alkyne cycloaddition (CuAAC), commonly known as click chemistry, making it valuable in drug discovery, bioconjugation, and the development of diagnostic probes. Its polyether (PEG-like) spacer enhances solubility and improves pharmacokinetic properties of conjugated molecules.