You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule N-[(3S)-1-[(5-cyanothiophen-3-yl)methyl]-2-oxopyrrolidin-3-yl]-7-methoxynaphthalene-2-sulfonamide into molecular formula.
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C21H19N3O4S2
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