You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[1-[(2-chloro-4-fluorophenyl)methyl]piperidin-3-yl]-N,N-dimethyl-1H-pyrrole-3-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H23ClFN3O
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