You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[[4-[(2Z)-2-[(3-bromo-4-phenylmethoxyphenyl)methylidene]hydrazinyl]-3-nitrophenyl]sulfonylamino]benzoic acid The above is the IUPAC name of a molecule. Write its molecular formula.
user
C27H21BrN4O7S
assistant