Used in solid-phase peptide synthesis to introduce a modified ornithine residue with orthogonal protection. The Fmoc group allows for mild base deprotection during stepwise synthesis, while the Boc group on the side chain ensures stability under these conditions. The alpha-methyl modification enhances metabolic stability and can influence peptide conformation, making it valuable in developing peptidomimetics and bioactive peptides with improved pharmacokinetic properties. Commonly applied in research for drug design and study of enzyme substrates or inhibitors.