You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 3,4-difluoro-2-(2-fluoro-4-methylanilino)-N-methyl-5-[(E)-[2-oxo-2-(propan-2-ylamino)ethoxy]iminomethyl]benzamide into molecular formula.
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C21H23F3N4O3
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