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 4-[(2S)-2-[2-(2-oxopyrrolidin-1-yl)ethyl]piperidin-1-yl]sulfonylbenzonitrile is given. What is its corresponding molecular formula?
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C18H23N3O3S
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