Used as a key intermediate in peptide synthesis and bioconjugation chemistry, particularly for the selective protection and modification of guanidine groups in arginine residues. Its dual Boc-protected structure allows controlled deprotection steps, enabling sequential coupling reactions in solid-phase peptide synthesis. The carboxymethyl group provides a handle for further functionalization, such as amide bond formation or linker attachment in the development of pharmaceuticals, enzyme inhibitors, or diagnostic probes. Due to its stability and solubility in common organic solvents, it is favored in multi-step syntheses requiring high purity and minimal side reactions.