You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-(1-methylpyrrolidin-1-ium-1-yl)-1-[4-[4-[2-(1-methylpyrrolidin-1-ium-1-yl)acetyl]phenyl]phenyl]ethanone The above is the IUPAC name of a molecule. Write its molecular formula.
user
C26H34N2O2+2
assistant