Z-N-Me-Thr-OH·CHA, with the CAS number 253595-72-1, is a chemical compound consisting of N-methyl-L-threonine protected at the N-terminus with a benzyloxycarbonyl (Z or Cbz) group and isolated as a cyclohexylammonium (CHA) salt. This specific salt form enhances the compound's stability and crystallinity, making it more suitable for handling and storage in synthetic applications. This compound is primarily utilized as a chiral, protected amino acid derivative in peptide synthesis, particularly in the pharmaceutical industry. The N-methylation of the amino acid backbone is a critical modification that can significantly alter the biological and pharmacokinetic properties of the resulting peptides, such as improving metabolic stability, membrane permeability, and bioavailability. Therefore, Z-N-Me-Thr-OH·CHA serves as a crucial building block for the synthesis of complex peptide-based drugs and bioactive peptides. As a derivative of the proteinogenic amino acid threonine, it falls under the category of modified amino acids. Its primary value lies in its role as a specialized, non-natural amino acid synthon for constructing peptides with tailored properties, making it a key reagent in medicinal chemistry and peptide research.