You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[1-(4-chlorophenyl)ethyl]-N-methyl-2-oxo-2-(1,3,5-trimethylpyrazol-4-yl)acetamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C17H20ClN3O2
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