Used in the synthesis of peptide-based pharmaceuticals, particularly in the development of radiolabeled compounds for positron emission tomography (PET) imaging. Its fluorine atoms allow for efficient labeling with fluorine-18, enhancing imaging sensitivity. Also employed in research to study enzyme mechanisms and protein structure due to its ability to mimic natural amino acids while introducing electronic and steric changes. Commonly utilized in medicinal chemistry for optimizing the metabolic stability and bioavailability of bioactive peptides.