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(A) Overlay of structures of 1 (grey; PDB 4GWT), 1(S18β3S) (cyan) and 1(S18[S,S]ACPC) (yellow). (B) Close-up view of superimposed, isolated loops from (A). (C–E) 4:6 hydrogen-bonding arrangements in the three structures shown in (A) and (B), with distances between amide nitrogen and oxygen atoms reported in Å. For all residues except ACPC, only backbone atoms are shown.
