Fig 7. Crystal structure of compound 9 [31] in complex with FXIa.

Compound 9 is displayed in thick sticks with green carbons, selected binding site residues in thin sticks with grey carbons, water oxygens in red spheres, and hydrogen bond interactions with dashed lines. The arrows indicate: (1) the central water molecule, (2) the hydrogen acceptor of the P1-P1’ amide and (3) the hydrogen donor of the P1’-P2’ amide.