You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name (3aS,4R,9bR)-6,9-dichloro-4-(2,4-dichlorophenyl)-3a,4,5,9b-tetrahydro-3H-cyclopenta[c]quinoline into its molecular formula.
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C18H13Cl4N
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