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-[(2R)-butan-2-yl]-3-(4-methyl-3-oxo-1,4-benzoxazin-7-yl)-1,2,4-oxadiazole-5-carboxamide is given. What is its corresponding molecular formula?
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C16H18N4O4
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