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 tricyclo[5.3.1.04,11]undeca-1(10),2,4,6,8-pentaene-2,3,5,6,8,9,10-heptacarbonitrile .
user
C18HN7
assistant