H-Phe(3,5-DiF)-OH is a difluorophenylalanines in the L-configuration [L-(F2)Phe]. H-Phe(3,5-DiF)-OH can be incorporated into the thrombin receptor-tethered ligand peptide SFLLRNP to identify the phenyl hydrogens of the Phe-2 residue involved in the CH/π receptor interaction[1].
[1]. Fujita T, et al. Synthesis of a complete set of l-difluorophenylalanines, l-(F2)Phe, as molecular explorers for the CH/π interaction between peptide ligand and receptor. Tetrahedron Letters. 2000, 41(6):923-927.