Used in peptide synthesis as a protected hydrazine derivative, enabling selective conjugation and bioconjugation applications. Its structure supports solid-phase synthesis, particularly in preparing modified peptides and protein labeling. The fluorenylmethyloxycarbonyl (Fmoc) group allows for mild deprotection, making it ideal for stepwise synthesis in automated peptide manufacturing. Also employed in the development of bioactive molecule probes and drug delivery systems due to its stability and specific reactivity under controlled conditions.