You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-ethyl-2-methyl-6-[[2-methyl-3-(4-methylphenyl)-4-oxocyclopenten-1-yl]methyl]-4-(4-methylphenyl)-5-oxo-4,4a-dihydrocyclopenta[b]pyridine-3-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C33H34N2O3
assistant