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X-ray crystal structure of the WDR5–47 complex (PDB code 4IA9). Compound 47 (gray sticks) binds in the central cavity of WDR5. Addition of methyl and fluoro substituents at positions 3 and 4 of the 2-chlorophenyl moiety optimizes occupancy of the side cavity and introduces additional interactions with surrounding hydrophobic side chains (orange). Color coding: white, carbon; red, oxygen; blue, nitrogen; green, chlorine; magenta, fluorine.
