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 1-ethyl-2-[2-(4-pyrazol-1-ylphenyl)ethyl]-3-[2-[[4-(trifluoromethyl)pyrimidin-2-yl]amino]ethyl]guanidine into molecular formula.
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C21H25F3N8
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