Used in peptide synthesis as a protected amino acid building block, particularly in solid-phase peptide synthesis (SPPS). This compound is an Fmoc-N-methyl protected derivative of (R)-6-acetamido-2-aminohexanoic acid (N^ε-acetyl-L-lysine). The Fmoc group provides temporary protection for the N-methylated alpha-amine functionality, allowing selective deprotection under mild basic conditions, while the acetamido group protects the epsilon-amine of the lysine side chain, preventing unwanted reactions. Enables the controlled, stepwise assembly of complex peptides with high purity and yield. Commonly employed in research and development of therapeutic peptides, biochemical probes, and protein mimetics.