You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Convert the IUPAC name of a molecule N-(7-chloro-3,4-dihydro-2H-1,5-benzodioxepin-8-yl)-2-[[5-(4-methylphenyl)-1,3,4-oxadiazol-2-yl]sulfanyl]acetamide into molecular formula.
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C20H18ClN3O4S
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