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 3-[[3-[(2,4-dioxo-1,3-thiazolidin-5-ylidene)methyl]indol-1-yl]methyl]benzoate is given. What is its corresponding molecular formula?
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C21H16N2O4S
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