Z-L-Leucine N-hydroxysuccinimide ester is a protected, activated amino acid derivative in which L-leucine is converted to an N-hydroxysuccinimide (NHS) ester at the amino terminus and bears a Z (benzyloxycarbonyl, Cbz) protecting group on the nitrogen functionality. The molecule contains a free carboxyl group and an NHS-activated amine equivalent that can undergo nucleophilic substitution by amines to form amide linkages, while the Z group helps control chemoselectivity by masking the nitrogen during handling and coupling. This activated leucine derivative is used in peptide and bioconjugation workflows as a precursor for introducing leucine-containing amide bonds and for preparing labeled or functionalized amino acid building blocks under conditions compatible with NHS ester chemistry.
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