You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 1-[8-(4-chloro-3-fluorophenyl)-1,6-naphthyridin-2-yl]-4-hydroxy-3,4-dimethylpentan-1-one .
user
C21H20ClFN2O2
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