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 2-(4-tert-butylphenyl)-1,3,10-triazatricyclo[6.4.1.04,13]trideca-2,4,6,8(13)-tetraen-9-one .
user
C20H21N3O
assistant