You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named N-(9-dibenzofuran-2-yl-9-phenylfluoren-2-yl)-N-(4-phenylphenyl)dibenzothiophen-3-amine by IUPAC nomenclature, provide its molecular formula.
user
C55H35NOS
assistant