You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule N,N-bis(4-tert-butylphenyl)-9-[phenyl(spiro[3,4-dihydrothioxanthene-9,9'-fluorene]-2-yl)methyl]dibenzothiophen-1-amine into molecular formula.
user
C64H55NS2
assistant