Used in peptide synthesis as a building block, particularly in solid-phase peptide synthesis (SPPS). The Fmoc group provides protection for the amino group during the synthesis process, while the nitro group on the phenyl ring can serve as a reactive site for further chemical modifications. It is valuable in creating peptides with specific functionalizations or for studying peptide interactions and structures. Its application is common in pharmaceutical research, biochemistry, and material science for designing peptides with tailored properties.