You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
6-[(5-bromo-6-ethyl-4-quinoxalin-6-yloxy-7H-pyrrolo[2,3-d]pyrimidin-2-yl)oxy]-1-oxidoquinoxalin-1-ium is the IUPAC name of a molecule. Please give its molecular formula.
user
C24H16BrN7O3
assistant