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 N-(4-chlorophenyl)-N,4-dimethyl-8-pyridin-4-yl-4,5-dihydro-2,3-benzodiazepine-3-carboxamide into molecular formula.
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C23H21ClN4O
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