You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
8-N'-(9,9-dimethylfluoren-2-yl)-3-N,3-N-diphenyl-8-N'-(2-phenylphenyl)spiro[fluorene-9,6'-indeno[2,1-b][1]benzothiole]-3,8'-diamine is the IUPAC name of a molecule. Please give its molecular formula.
user
C66H46N2S
assistant