You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-bromo-6,6-dimethyl-8-[2-oxo-2-(4-propan-2-ylsulfonylpiperazin-1-yl)ethoxy]-5H-benzo[b]carbazol-11-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C27H30BrN3O5S
assistant