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 6-[[4-(4-chlorophenyl)-2-(4,4-difluoro-4-iodobutyl)-6-oxopyrimidin-1-yl]methyl]pyridine-2-carboxylic acid .
user
C21H17ClF2IN3O3
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