You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Convert the IUPAC name of a molecule 2-(3-chlorophenyl)-5-N-[(3,3-difluorocyclobutyl)methyl]-6,7-dihydro-4H-pyrazolo[1,5-a]pyrazine-3,5-dicarboxamide into molecular formula.
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C19H20ClF2N5O2
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