You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-([1]benzofuro[3,2-b]carbazol-11-yl)-3-[2-(12,12-dimethylindeno[1,2-c]carbazol-5-yl)-3-isocyanophenyl]benzonitrile is the IUPAC name of a molecule. Please give its molecular formula.
user
C53H32N4O
assistant