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 [1-[3-chloro-5-(trifluoromethyl)pyridin-2-yl]piperidin-4-yl]-(4-methylphenyl)methanone is given. What is its corresponding molecular formula?
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C19H18ClF3N2O
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