You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
6-(2-methylpropanoylamino)-N-[[1-[3-(trifluoromethyl)phenyl]pyrazol-4-yl]methyl]pyridine-2-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H20F3N5O2
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