This compound, (S)-Benzyl 2-amino-6-((tert-butoxycarbonyl)amino)hexanoate hydrochloride, is a derivative of L-lysine serving as an intermediate in the synthesis of peptides and amino acid derivatives, particularly in pharmaceutical research and development. It features a free α-amino group (protected as the hydrochloride salt), a tert-butoxycarbonyl (Boc)-protected ε-amino group on the lysine side chain to prevent unwanted side reactions during synthesis, and a benzyl ester protecting the carboxylic acid group for selective deprotection. This configuration enables precise control in peptide assembly and the construction of complex organic molecules. Its applications include the production of bioactive peptides, therapeutic agents, enzyme inhibitors, and receptor ligands, advancing drug discovery and biochemical research.