You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule identified by (3aS,4R,9bR)-6,7-dichloro-4-(2-nitrophenyl)-3a,4,5,9b-tetrahydro-3H-cyclopenta[c]quinoline ?
user
C18H14Cl2N2O2
assistant