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-N,4-N-dimethyl-1-N-(2-thiophen-2-ylphenyl)benzene-1,4-disulfonamide is given. What is its corresponding molecular formula?
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C18H18N2O4S3
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