You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-(4-dibenzothiophen-4-ylphenyl)-9,9-dimethyl-N-[4-(2-naphthalen-1-ylphenyl)phenyl]-7-phenylfluoren-2-amine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C61H43NS
assistant