This compound, (R)-(9H-Fluoren-9-yl)methyl (1-hydroxy-4-methylpentan-2-yl)carbamate, is the Fmoc-protected derivative of (R)-leucinol, a chiral amino alcohol. It serves as a specialized building block in solid-phase peptide synthesis (SPPS) and the synthesis of peptidomimetics. The fluorenylmethyloxycarbonyl (Fmoc) group protects the amino functionality, allowing selective reactions at the primary hydroxyl group or incorporation into peptide chains as a C-terminal modifier. The Fmoc protecting group is readily removed under mild basic conditions, enabling the controlled assembly of complex peptide structures. This reagent is essential for producing modified peptides and protein analogs in pharmaceutical and biochemical research.