You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named N-[(2S)-butan-2-yl]-N-[(2R)-butan-2-yl]-2-[[5-(2,4-dimethoxyphenyl)-1,3,4-oxadiazol-2-yl]sulfanyl]acetamide by IUPAC nomenclature, provide its molecular formula.
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C20H29N3O4S
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