Used primarily in peptide synthesis, it serves as a protecting group for methionine residues. The Fmoc group ensures selective deprotection during solid-phase peptide synthesis, allowing for precise control over the assembly of peptide chains. It is particularly useful in preventing unwanted side reactions and oxidation of methionine. Commonly employed in the production of pharmaceuticals, bioactive peptides, and research applications where high-purity peptides are required. Its stability and ease of removal make it a valuable tool in organic and medicinal chemistry.