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 (5S,6S)-1,10,11-trimethyl-3,8-diphenyl-2,3,8,9-tetrazadispiro[4.0.46.15]undeca-1,9-diene-4,7-dione .
user
C22H20N4O2
assistant