You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-[[2-[(4,4-dimethyl-2,5-dioxoimidazolidin-1-yl)methyl]-4,5-dimethylphenyl]methyl]-5,5-dimethylimidazolidine-2,4-dione The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H26N4O4
assistant