You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-[1-(2,4,6-trimethylphenyl)carbazol-9-yl]-2-(2,4,6-triphenylphenyl)isoindole-1,3-dione is the IUPAC name of a molecule. Please give its molecular formula.
user
C53H38N2O2
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