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 1-[2,5-dimethyl-1-[3-(trifluoromethyl)phenyl]pyrrol-3-yl]-2-(6-methyl-2-nitropyridin-3-yl)oxyethanone is given. What is its corresponding molecular formula?
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C21H18F3N3O4
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