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(A) Cis-trans ratio and rotational energy barrier of Ac-CH3-Pro-OMe and Ac-CF3-Pro-OMe peptide models [107]. (B) Chemical structures of 2-CF3-Pro and 2-CF3-Oxa residues to improve the conformational stability of the d-Pro-l-Pro template [125]. (C) Chemical structure of the fluorinated CDR3 Nb80 cyclic mimetic [125].
