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 7-fluoro-3-[5-(1-hydroxycyclopropyl)-1,2,4-oxadiazol-3-yl]-5-(2-methyloxolan-2-yl)imidazo[1,5-a]quinoxalin-4-one is given. What is its corresponding molecular formula?
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C20H18FN5O4
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