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-[2-[[1-(2,6-difluorophenyl)cyclopentyl]methylamino]-2-oxoethyl]-3-nitrobenzamide is given. What is its corresponding molecular formula?
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C21H21F2N3O4
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