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 4-[4-[1-(3-chloro-4-fluorophenyl)-2-(dimethylamino)ethyl]piperazin-1-yl]-7,8-dihydro-5H-pyrido[2,3-d]pyrimidin-6-one is given. What is its corresponding molecular formula?
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C21H26ClFN6O
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