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 8-fluoro-3,4-dimethyl-1-(3-methylpyridin-4-yl)imidazo[1,5-a]quinoxalin-6-ol is given. What is its corresponding molecular formula?
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C18H15FN4O
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