You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule 2-benzyl-8-(bromomethyl)-6a,9a-dichloro-6-(4-hydroxy-3,5-dimethoxyphenyl)-3a,4,6,10,10a,10b-hexahydroisoindolo[5,6-e]isoindole-1,3,7,9-tetrone ?
user
C30H27BrCl2N2O7
assistant