Used in peptide synthesis as a protected intermediate for constructing complex bioactive peptides. The Boc (tert-butoxycarbonyl) group provides temporary protection of the amino terminus, allowing stepwise assembly without side reactions. The Gly-Gly-Phe-Gly sequence mimics structural motifs found in natural peptides, making it valuable in the development of pharmaceuticals, enzyme substrates, and opioid peptide analogs. The TFA salt form enhances solubility and stability during handling and coupling reactions. Commonly employed in solid-phase and solution-phase peptide synthesis for research in medicinal chemistry and drug design.