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 2-[(E)-2-[4-(dimethylamino)phenyl]ethenyl]-1-(6-sulfonatosulfanylhexyl)pyridin-1-ium is given. What is its corresponding molecular formula?
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C21H28N2O3S2
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