You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named N-[1-(4,5-difluoro-2-methoxyphenyl)ethyl]-3-(5,5-dimethyl-2H-1,2,4-oxadiazol-3-yl)pyrazolo[1,5-a]pyrimidin-5-amine by IUPAC nomenclature, provide its molecular formula.
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C19H20F2N6O2
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