Used as a key intermediate in the synthesis of biologically active compounds, particularly in pharmaceutical development. Its protected amine and carboxylic acid functional groups make it valuable for peptide-like structures and heterocyclic scaffolds. Commonly employed in medicinal chemistry for constructing constrained ring systems that influence potency and metabolic stability. Frequently found in the development of protease inhibitors and receptor modulators due to its rigid cyclobutane backbone. Ideal for solid-phase and solution-phase synthesis where selective deprotection and coupling are required.