You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(1S,2R,6S,7S)-11-[(4-methylphenyl)methyl]-4-phenyl-4,11-diazatricyclo[5.3.1.02,6]undec-9-ene-3,5,8-trione is the IUPAC name of a molecule. Please give its molecular formula.
user
C23H20N2O3
assistant