You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 6-[9-[2-(2,4-diphenylphenyl)-1-hydroxy-3-oxo-1H-isoindol-4-yl]carbazol-2-yl]pyridine-2-carbonitrile by IUPAC nomenclature, provide its molecular formula.
user
C44H28N4O2
assistant