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 (1E,6E)-1,7-bis(2-fluoro-4-methoxyphenyl)-5-hydroxyhepta-1,4,6-trien-3-one is given. What is its corresponding molecular formula?
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C21H18F2O4
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