The co-crystal structure of compound 9 bound to ALK (PDB 4CMU, 1.8 Å). Left panel: Interaction of compound 9 with the protein. The protein is depicted as yellow ribbons, and the hydrogen bonds are illustrated with blue dashed lines; Right panel: The compound 9 binding site in ALK, protein is shown as surface. Compound 9 atoms are colored as follows: carbon, red-orange; nitrogen, blue; oxygen, red; chlorine, green; fluorine, jade; hydrogen, white; the chiral carbon is highlighted in violet.