You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named 2-(3,4-dimethylphenyl)-4,7,8,9,10,10a-hexahydro-3H-pyrido[1,2-a][1,4]diazepine-1,5-dione by IUPAC nomenclature, provide its molecular formula.
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C17H22N2O2
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