You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-benzo[c]carbazol-7-yl-2-(5-carbazol-9-yl-14,14-dimethyl-9-azapentacyclo[11.7.0.02,10.03,8.015,20]icosa-1(13),2(10),3(8),4,6,11,15,17,19-nonaen-9-yl)-4-isocyanobenzonitrile The above is the IUPAC name of a molecule. Write its molecular formula.
user
C57H35N5
assistant