You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 4-[(3E)-3-[(3,4-dimethylphenyl)-hydroxymethylidene]-2-(2-methylphenyl)-4,5-dioxopyrrolidin-1-yl]benzonitrile by IUPAC nomenclature, provide its molecular formula.
user
C27H22N2O3
assistant