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 N-[3-[5-amino-3-(difluoromethyl)-2,6-dihydro-1,4-oxazin-3-yl]-4-fluorophenyl]-5-(difluoromethyl)pyridine-2-carboxamide is given. What is its corresponding molecular formula?
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C18H15F5N4O2
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