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 2,4-difluoro-6a,7,7a,8,9,10,11,11a-octahydro-5H-indolo[1,2-a]quinoxalin-6-one is given. What is its corresponding molecular formula?
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C15H16F2N2O
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