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 N-(4-amino-3,4-dioxo-1-phenylbutan-2-yl)-4-(2-oxo-1,3-dihydroindol-4-yl)-1,2,5-thiadiazole-3-carboxamide is given. What is its corresponding molecular formula?
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C21H17N5O4S
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