Dicyclohexylamine (S)-2-((tert-butoxycarbonyl)amino)pentanoate is the dicyclohexylammonium salt of N-Boc-protected (S)-norvaline, a chiral α-amino acid derivative. It is primarily employed as a building block in peptide synthesis, particularly in solid-phase methods, where the Boc group temporarily protects the amino functionality during coupling reactions to avoid side reactions and ensure regioselectivity. This compound is crucial in pharmaceutical research and development for creating peptide-based drugs and biologics. The salt form improves handling, solubility, and stability in organic solvents, facilitating its use in intricate organic syntheses. It also acts as a chiral intermediate for producing enantiomerically pure compounds essential in active pharmaceutical ingredient (API) manufacturing.