You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Translate the chemical IUPAC name 2-chloro-N-[1-[(3,5-diethoxy-4-fluorophenyl)methyl]piperidin-4-yl]-5-methoxypyrimidin-4-amine into its molecular formula.
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C21H28ClFN4O3
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