Fmoc-Phe(4-CONH2)-OH is an amino acid derivative with an Fmoc protecting group, which can be used to synthesize a small-sized HTLV-I protease inhibitor with hydrophilicity[1].
References
[1] Nguyen, et al. "Design and synthesis of several small-size HTLV-I protease inhibitors with different hydrophilicity profiles." Bioorganic & medicinal chemistry letters 21.8 (2011): 2425-2429. DOI:10.1016/j.bmcl.2011.02.066
