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 (6R,9R)-6-(3-bromo-4-methoxyphenyl)-9-(4-methylphenyl)-5,6,8,9,10,11-hexahydrobenzo[b][1,4]benzodiazepin-7-one .
user
C27H25BrN2O2
assistant