You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
9,9-dimethyl-N-[4-(12-naphthalen-1-yl-[1]benzofuro[3,2-a]carbazol-6-yl)phenyl]-N-(4-phenylphenyl)fluoren-2-amine is the IUPAC name of a molecule. Please give its molecular formula.
user
C61H42N2O
assistant