You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named 4-[4-(3-fluorobenzoyl)-2-(methoxymethyl)piperazin-1-yl]-2-(trifluoromethyl)benzonitrile is given. What is its corresponding molecular formula?
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C21H19F4N3O2
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