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Under IUPAC nomenclature, a molecule named 5-chloro-6-(2-chloro-4-fluorophenyl)-7-[[(2R)-3,3-dimethylbutan-2-yl]amino]-N'-hydroxypyrazolo[1,5-a]pyrimidine-3-carboximidamide is given. What is its corresponding molecular formula?
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C19H21Cl2FN6O
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