Z-Asn-OtBu is a protected amino acid derivative consisting of L-asparagine bearing an N-benzyloxycarbonyl (Z, Cbz) protecting group and a tert-butyl ester (OtBu) at the carboxyl terminus, classifying it as a protected Asn building block for peptide chemistry. The molecule contains a free side-chain amide characteristic of asparagine, while the Z group masks the amino functionality and the tert-butyl ester masks the carboxylic acid to control chemoselectivity during coupling and to suppress undesired side reactions. Z-Asn-OtBu is used as a precursor in protected amino acid strategies and stepwise peptide synthesis workflows, where deprotection and subsequent amide bond formation can be performed to assemble asparagine-containing peptide structures.
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