You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[2-(3,4-dimethoxyphenyl)ethyl]-N-[1-(4-methylphenyl)-2,5-dioxopyrrolidin-3-yl]-3-nitrobenzamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C28H27N3O7
assistant