You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named N-[1-(3-chloro-2,2-dimethylpropanoyl)piperidin-4-yl]-2-(4-chlorophenoxy)acetamide by IUPAC nomenclature, provide its molecular formula.
user
C18H24Cl2N2O3
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