Widely used in peptide synthesis, this compound serves as a protected N-methyl-amino acid building block, specifically N-Fmoc-N-methyl-L-cyclohexylalanine, for introducing hydrophobic residues with a cyclohexyl side chain. The Fmoc group provides mild base-labile protection of the N-methyl alpha-amino group, compatible with solid-phase peptide synthesis (SPPS), enabling stepwise assembly of peptides under basic conditions without affecting other sensitive functional groups. The S-stereochemistry at the alpha-carbon ensures chiral purity in the resulting peptide, critical for biological activity in pharmaceutical applications. The N-methylation enhances resistance to enzymatic degradation and influences peptide conformation and bioavailability. Commonly employed in the production of therapeutic peptides, research reagents, and studies involving structure-activity relationships of bioactive peptides.