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(A) Overlay of bound 2 and 4. (B) Overlay of bound 4 and 5. (C) Overlay of bound 4 and 6. (D) Overlay of bound 4 and 7. (E) Structures of iodophenol precursors and Y220C fragment ligands 4–7. Color coding: 2, light blue (PDB: 5O1I);424, pink sticks (PDB: 5AOJ);445, gray sticks (PDB: 2VUK);516 yellow sticks (PDB: 5G4O);457, green sticks (PDB: 5AOL).44 The halogen bond to L145 is shown as dashed orange lines.
