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 ethyl (4S)-6-[(4-chloro-3-pyrrolidin-1-ylsulfonylbenzoyl)oxymethyl]-4-ethyl-2-oxo-3,4-dihydro-1H-pyrimidine-5-carboxylate is given. What is its corresponding molecular formula?
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C21H26ClN3O7S
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