Z-O-tert.butyl-L-threoninedicyclohexylamine salt is a protected threonine derivative in which the threonine side chain bears a tert-butyl O-protecting group and the amino acid is present as an acid-base salt with dicyclohexylamine. The molecule contains an amino functionality and a carboxylate/acidic group associated with the salt form, while the "Z-O-" designation indicates an additional oxygen-protecting/derivatizing element on the hydroxyl-bearing side chain that modulates chemoselectivity during peptide-related transformations. As a non-free, salt-form amino acid building block, it is commonly used in controlled amino-acid coupling workflows and in synthesis of threonine-containing peptide intermediates where masking of the hydroxyl functionality and salt formation can influence solubility, handling, and side-reaction suppression.
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