You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule 2-[(3aS,4S,7aR)-3-oxo-1,2,3a,4,5,6,7,7a-octahydroinden-4-yl]-N,N-diethyl-2-oxoacetamide ?
user
C15H23NO3
assistant