You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule (6R,9S)-9-(4-ethoxy-3-methoxyphenyl)-6-(2-nitrophenyl)-5,6,8,9,10,11-hexahydrobenzo[b][1,4]benzodiazepin-7-one ?
user
C28H27N3O5
assistant