Z-Lys(Fmoc)-OH is an Fmoc-protected lysine derivative in which the alpha-amino group is protected by a benzyloxycarbonyl (Z, Cbz) carbamate and the side-chain epsilon-amino group is protected as an Fmoc carbamate, retaining the lysine backbone with both an amino acid alpha-carboxyl group and a protected amino functionality. The molecule bears the characteristic lysine side chain (-(CH2)4-) and, with both amines masked as carbamates, it functions as a protected amino acid building block that can be selectively deprotected under peptide-synthesis conditions to regenerate amine nucleophiles. Z-Lys(Fmoc)-OH is employed in stepwise peptide synthesis and related solid-phase or solution-phase assembly workflows where orthogonal protection patterns support controlled incorporation of lysine and subsequent formation of amide bonds at the desired positions.
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