Used as a chiral derivatizing agent in organic synthesis, particularly in the preparation of peptide mimetics and enzyme inhibitors. Its structure allows for selective protection of amino groups in asymmetric synthesis, making it valuable in pharmaceutical research for developing optically active compounds. Commonly employed in solid-phase peptide synthesis due to the stability and ease of removal of the fluorenylmethyl carbamate (Fmoc) group under mild basic conditions. The chloroacyl moiety enables further functionalization, facilitating the construction of complex molecules with defined stereochemistry.