You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[9-[3-bromo-4-[2-nitro-4-(trifluoromethyl)phenoxy]phenyl]-1,8-dioxo-3,4,5,6,7,9-hexahydro-2H-acridin-10-yl]acetic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C28H22BrF3N2O7
assistant