Used in peptide synthesis as a chiral building block for incorporating non-natural amino acid residues into peptides. The Fmoc group allows for solid-phase synthesis by providing orthogonal protection for the amine functionality, enabling stepwise assembly of complex peptide sequences. The (R)-3-amino-3-(3-methylphenyl)propionic acid moiety introduces steric bulk and aromatic character, which can enhance peptide stability, influence conformation, and improve binding selectivity in bioactive peptides. Commonly applied in the development of peptidomimetics and pharmaceutical research where modified backbones are required for optimizing metabolic stability and receptor interaction.