You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3R)-1-(4-methylphenyl)-3-[4-[(3R)-1-(4-methylphenyl)-2,5-dioxopyrrolidin-3-yl]piperazine-1,4-diium-1-yl]pyrrolidine-2,5-dione is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H30N4O4+2
assistant