You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule (3aR,4R,9bR)-4-[3-bromo-4-[(2,4-dichlorophenyl)methoxy]-5-methoxyphenyl]-7,9-dichloro-3a,4,5,9b-tetrahydro-3H-cyclopenta[c]quinoline .
user
C26H20BrCl4NO2
assistant