N-Boc-L-3-nitrophenylalanine is a protected amino acid derivative. It features an L-configuration, a 3-nitrophenyl side chain, and a tert-butoxycarbonyl (Boc) protecting group on the amine functionality. This compound is a solid at room temperature. This molecule serves as a crucial chiral building block in the synthesis of peptides and peptidomimetics. Its primary application is in medicinal chemistry research and pharmaceutical development, where it is used to incorporate the unnatural amino acid residue 3-nitrophenylalanine into target molecules. The nitro group on the aromatic ring provides a versatile handle for further chemical modifications, such as reduction to an amine, enabling the exploration of structure-activity relationships in drug discovery programs. The Boc protecting group is stable under a wide range of conditions but can be cleanly removed under acidic conditions, making this compound a valuable and versatile intermediate for solid-phase peptide synthesis (SPPS) and solution-phase synthesis of complex bioactive molecules.