You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named 1-[7-(diethylaminomethyl)-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazin-5-yl]pentan-1-one by IUPAC nomenclature, provide its molecular formula.
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C16H28N4O
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