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 2,6-difluoro-N-[[5-[2-(4-methylpiperidin-1-yl)-2-oxoethyl]sulfanyl-1,3,4-oxadiazol-2-yl]methyl]benzamide is given. What is its corresponding molecular formula?
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C18H20F2N4O3S
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