You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named 2-tert-butyl-N-(3-methylbutan-2-yl)-5-phenylpyrazolo[1,5-a]pyrimidine-7-carboxamide is given. What is its corresponding molecular formula?
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C22H28N4O
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