You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-(3-chlorophenyl)-N-[2-[3-(difluoromethoxy)-4-methoxyphenyl]ethyl]-5-ethylpyrazole-4-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H22ClF2N3O3
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