You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named 5-benzyl-N-(9-methyl-8-oxo-6,7-dihydro-5H-imidazo[1,2-a][1,3]diazepin-7-yl)-4H-pyrazole-3-carboxamide by IUPAC nomenclature, provide its molecular formula.
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C19H20N6O2
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