Used in peptide synthesis, particularly in solid-phase peptide synthesis (SPPS) as a building block. It helps in introducing the phenylalanine derivative with a methyl group at the para position into peptide chains. This modification can enhance the stability, hydrophobicity, or specific interactions of the synthesized peptides. Commonly applied in the development of bioactive peptides, peptidomimetics, and in pharmaceutical research for drug discovery. Its Fmoc group is easily removable under basic conditions, making it suitable for stepwise peptide assembly.