N-ε-Trifluoroacetyl-L-lysine is a protected lysine derivative in which the ε-amino group of L-lysine is acylated with a trifluoroacetyl (-COCF3) group, while the α-amino and α-carboxyl functional groups remain present as part of the amino acid framework. The molecule therefore bears a trifluoroacetamide on the side chain that reduces the nucleophilicity of the ε-nitrogen and provides a fluorinated carbonyl handle, with stereochemistry specified as L at the α-carbon. In peptide and chemical biology workflows, this protected amino acid is used as a precursor for incorporating a lysine side chain in controlled form, supporting stepwise synthesis and side-chain chemoselectivity where an ε-amino protecting group is required.
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