You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named 3-[3-amino-4-[6-(2-methyl-5-oxo-1H-pyrazol-4-yl)pyrazolo[1,5-a]pyrazin-4-yl]pyrazol-1-yl]cyclobutane-1-carbonitrile by IUPAC nomenclature, provide its molecular formula.
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C18H17N9O
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