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 (3aS,4R,9bS)-4-(2-nitrophenyl)-3a,4,5,9b-tetrahydro-3H-cyclopenta[c]quinoline is given. What is its corresponding molecular formula?
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C18H16N2O2
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