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 methyl 2-[2-(2-ethylsulfonylbenzoyl)imino-5,6-dimethoxy-1,3-benzothiazol-3-yl]acetate is given. What is its corresponding molecular formula?
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C21H22N2O7S2
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