Used in peptide synthesis as a protected amino acid derivative, enabling selective coupling and chain elongation in solid-phase peptide synthesis. The Fmoc group provides base-labile protection for the alpha-amino group, while the diazomethane-derived CHN2 moiety allows for efficient activation and incorporation into peptide chains. Commonly employed in the preparation of proline-containing peptides, which are important in the synthesis of collagen mimics, enzyme inhibitors, and bioactive peptides. Its stability under acidic conditions and clean deprotection under mild basic conditions make it suitable for automated synthesis and complex peptide architectures.