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 [9-[4-[(2R,6S)-2,6-dimethyl-4-(1-methylbenzimidazol-2-yl)piperazin-1-yl]butyl]fluoren-9-yl] N-[(4-fluorophenyl)methyl]carbamate .
user
C39H42FN5O2
assistant