You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Convert the IUPAC name of a molecule 5-chloro-2-N-[6-(4-methylpiperazin-1-yl)pyridin-3-yl]-4-N-[3-(trifluoromethyl)phenyl]pyrimidine-2,4-diamine into molecular formula.
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C21H21ClF3N7
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