Used in peptide synthesis as a protected amino acid building block, particularly in the development of pharmaceuticals where steric constraints from the cyclopropyl group enhance metabolic stability and receptor selectivity. The Boc (tert-butoxycarbonyl) group enables reversible protection of the amine functionality, allowing stepwise assembly of complex peptides. Commonly applied in research settings for synthesizing enzyme inhibitors, peptidomimetics, and bioactive compounds targeting CNS disorders and cancer. Its rigid cyclopropyl side chain influences peptide conformation, promoting desired secondary structures and improving pharmacokinetic profiles.