You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Convert the IUPAC name of a molecule 1-ethyl-3-[5-[5-(2-oxo-3H-1,3,4-oxadiazol-5-yl)pyridin-3-yl]-4-(5-phenyl-1,3,4-oxadiazol-2-yl)pyridin-2-yl]urea into molecular formula.
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C23H18N8O4
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