Z-Gln(Mtt)-OH is a protected amino acid derivative of glutamine bearing an Nα-benzyloxycarbonyl (Z) protecting group and an Mtt (methylthio-trityl) side-chain protecting group on the glutamine amide functionality, with the amino acid framework retaining both an amino group and a carboxyl group in protected form. The molecule contains a carbamate-protected α-amino group, a carboxylic acid (-COOH) suitable for coupling chemistry, and an Mtt-protected side-chain amide that masks the nucleophilic nitrogen to control chemoselectivity during peptide assembly. Z-Gln(Mtt)-OH is used as a building block in peptide synthesis and related derivatization workflows where orthogonal side-chain protection supports stepwise formation of peptide bonds and later selective deprotection of the glutamine side chain.
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