You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule (6S)-N-(2-methoxyethyl)-6-(4-methoxyphenyl)-9,9-dimethyl-7-oxo-6,8,10,11-tetrahydrobenzo[b][1,4]benzodiazepine-5-carboxamide into molecular formula.
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C26H31N3O4
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