Used in solid-phase peptide synthesis as a protected amino acid building block, particularly for incorporating N-methylated methionine residues into peptide chains. The Fmoc group allows for orthogonal protection, enabling selective deprotection under mild basic conditions while maintaining compatibility with other protecting groups. Its N-methylated structure enhances peptide stability and modulates conformation, often improving resistance to enzymatic degradation and influencing bioavailability. Commonly applied in the synthesis of complex peptides, including those with therapeutic potential such as antimicrobial or hormone analogs.