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 1-(2,6-difluorophenyl)-3-[(9-methoxy-2,3,4,6,7,11b-hexahydro-1H-benzo[a]quinolizin-2-yl)methyl]imidazolidine-2,4-dione .
user
C24H25F2N3O3
assistant