N-ε-Z-L-lysine methyl ester hydrochloride is a protected lysine derivative bearing an ε-benzyloxycarbonyl (Z) carbamate on the side-chain amino group and a methyl ester on the carboxyl group, with the backbone amino functionality present as the free primary amine. The molecule contains the characteristic lysine side chain terminating in a carbamate-protected ε-amino group, and the hydrochloride salt form indicates protonation of the remaining basic amino site to support aqueous handling and salt formation. In peptide and amino acid chemistry, this compound is used as a stepwise building block or intermediate for introducing lysine residues with controlled chemoselectivity, while the Z group and methyl ester protect functional groups during coupling and subsequent transformations to access more complex lysine-containing derivatives.
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