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 N-(3-chloro-2-pyrrolidin-1-ylphenyl)-2-[[5-(3-methylphenyl)-1,3,4-oxadiazol-2-yl]sulfanyl]acetamide is given. What is its corresponding molecular formula?
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C21H21ClN4O2S
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