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 3-[(3aS,5aS,6R,9aS,9bS)-3a,6-dimethyl-3,5,7-trioxo-1,2,4,5a,8,9,9a,9b-octahydrocyclopenta[a]naphthalen-6-yl]-N-(2-methylpropyl)propanamide .
user
C22H33NO4
assistant