You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the compound with this IUPAC name 9-[9-[5,6',11-tri(carbazol-9-yl)spiro[3,13-diazatricyclo[7.4.0.02,7]trideca-1(9),2(7),3,5,10,12-hexaene-8,9'-xanthene]-3'-yl]carbazol-3-yl]carbazole-3,6-dicarbonitrile ?
user
C85H47N9O
assistant