You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Name the molecular formula for the molecule established as 7'-isocyano-2-[3-(9-phenylcarbazol-3-yl)carbazol-9-yl]-9,9'-spirobi[fluorene]-2'-carbonitrile;7-[3-(9-phenylcarbazol-3-yl)carbazol-9-yl]dibenzofuran-3-carbonitrile;7-[3-(9-phenylcarbazol-3-yl)carbazol-9-yl]dibenzothiophene-3-carbonitrile;2'-[3-(9-phenylcarbazol-3-yl)carbazol-9-yl]-9,9'-spirobi[fluorene]-2-carbonitrile using the IUPAC nomenclature.
user
C199H115N13OS
assistant