Used as a key intermediate in the synthesis of peptide-based pharmaceuticals, particularly in solid-phase peptide synthesis where the Fmoc group enables selective deprotection. The vinylphenyl moiety allows for further functionalization via cross-coupling reactions or polymerization, making it useful in the development of bioactive molecules and specialty polymers. Its chiral center ensures stereochemical control during peptide assembly, which is critical for achieving desired biological activity in therapeutic peptides.