Boc-Nle-OH.DCHA is a Boc-protected norleucine derivative, commonly used as a building block in peptide synthesis. The tert-butoxycarbonyl (Boc) group protects the amino functionality, while the dicyclohexylammonium (DCHA) salt form enhances solubility and handling. It enables the selective incorporation of norleucine into peptide sequences during solid-phase peptide synthesis (SPPS) and solution-phase methods, preventing unwanted side reactions and ensuring precise control over peptide bond formation. The Boc protection provides orthogonality and stability, removable under mild acidic conditions post-coupling. This compound is vital for producing complex peptides and proteins in research and pharmaceutical applications, improving yield, purity, and biological activity of the final products.