You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 4-(4,5-dipyridin-4-ylcarbazol-9-yl)-2-(2,4,6-trimethylphenyl)isoindole-1,3-dione .
user
C39H28N4O2
assistant