You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[[2-[2-[4-(dimethylamino)phenyl]ethenyl]-3,3-dimethyl-5-nitroindol-1-ium-1-yl]methyl]-4-nitrophenol The above is the IUPAC name of a molecule. Write its molecular formula.
user
C27H27N4O5+
assistant