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 4-hexyl-2-methyl-4-nitro-1,3,5,7,8,9,10,10a-octahydropyrido[1,2-a][1,4]diazepine is given. What is its corresponding molecular formula?
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C16H31N3O2
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