You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule N-[(4aR,6R,7aR)-2-methyl-3-oxo-4,4a,5,6,7,7a-hexahydro-1H-cyclopenta[c]pyridin-6-yl]-N-methyl-4-(2-oxopyrrolidin-1-yl)benzamide .
user
C21H27N3O3
assistant