You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[(2-chloro-4-fluorophenyl)methyl]-N-methyl-N-[(4-pyrazol-1-ylphenyl)methyl]triazole-4-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
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C21H18ClFN6O
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