Used primarily in peptide synthesis as a protected chiral building block. Its Fmoc-protected amine group allows for mild deprotection in basic conditions, making it compatible with solid-phase peptide synthesis. The seven-membered lactam ring introduces conformational constraints, useful for designing bioactive peptides with enhanced stability and specificity. Commonly employed in the development of enzyme inhibitors and peptidomimetics, especially where controlled stereochemistry is critical. The carboxylic acid group enables easy coupling to amines, facilitating incorporation into larger molecular architectures.