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 2-(2-bromo-4-chlorophenoxy)-N-(2-methyl-3-oxo-4H-1,4-benzoxazin-6-yl)propanamide is given. What is its corresponding molecular formula?
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C18H16BrClN2O4
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