You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule [4-[(E)-N-[[2-(4-bromoanilino)-2-oxoacetyl]amino]-C-methylcarbonimidoyl]phenyl] thiophene-2-carboxylate into molecular formula.
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C21H16BrN3O4S
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