Dicyclohexylamine (2S,3R)-2-((tert-butoxycarbonyl)amino)-3-hydroxybutanoate is the dicyclohexylammonium salt of N-Boc-L-threonine, a chiral protected amino acid derivative. It is primarily utilized in the synthesis of complex organic molecules, particularly peptide-based drugs in the pharmaceutical industry. The Boc group serves as a key protecting agent for amino groups during coupling reactions, while the free side-chain hydroxyl allows selective reactivity. Its defined stereochemistry ensures high enantiomeric purity in chiral products. This intermediate plays a significant role in medicinal chemistry for creating biologically active compounds with therapeutic potential.