This compound, 2,6-bis(((benzyloxy)carbonyl)amino)hexanoic acid, is a protected derivative of lysine (N^α,N^ε-di-Cbz-lysine) used as a key building block in solid-phase and solution-phase peptide synthesis. The benzyloxycarbonyl (Cbz) protecting groups shield both the α-amino and ε-amino functionalities, enabling selective activation and coupling of the carboxylic acid group to form peptide bonds while preventing unwanted side reactions. Deprotection occurs under mild conditions, typically via catalytic hydrogenation, which is compatible with sensitive peptide sequences. This reagent is essential for incorporating lysine residues into bioactive peptides, peptidomimetics, and pharmaceutical compounds, offering high stability and versatility in organic synthesis protocols.