You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule cyano-(2,3,4,5,6-pentafluorophenyl)-(1,2,3-tricyano-6,7,8-triisocyanofluoren-9-ylidene)azanium .
user
C26H2F5N8+
assistant