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 (1S,9S)-4-bromo-10-(4-methoxyphenyl)-9-methyl-8-oxa-10,12-diazatricyclo[7.3.1.02,7]trideca-2(7),3,5-trien-11-one is given. What is its corresponding molecular formula?
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C18H17BrN2O3
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