You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named (4S)-5-(3-methoxybenzoyl)-4-methyl-3,4-dihydro-1H-1,5-benzodiazepin-2-one is given. What is its corresponding molecular formula?
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C18H18N2O3
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