Widely used in peptide synthesis, this compound serves as a protected proline derivative, enabling selective amine group coupling while preventing unwanted side reactions. The Fmoc group allows for mild base-induced deprotection, making it compatible with solid-phase synthesis strategies. Its stereochemistry supports the construction of conformationally constrained peptides, often applied in drug discovery and biochemical research. The tert-butoxycarbonyl (Boc) protection on the pyrrolidine nitrogen adds stability during synthetic steps, allowing sequential deprotection and elongation of peptide chains. Commonly employed in the preparation of pharmaceutical intermediates and bioactive molecules requiring precise stereocontrol.