You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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N-[6-(1,2-difluoroethyl)-4-oxo-1-(2,2,2-trifluoroethyl)-3a,7a-dihydropyrazolo[3,4-d]pyrimidin-5-yl]-2-phenylacetamide is the IUPAC name of a molecule. Please give its molecular formula.
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C17H16F5N5O2
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