You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance N-dibenzothiophen-2-yl-9-phenyl-N-spiro[benzo[a]phenalene-7,9'-xanthene]-2'-ylcarbazol-3-amine .
user
C59H36N2OS
assistant