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 tert-butyl N-[2-[(3aR,7aS)-2,3,3a,4,5,6,7,7a-octahydroindol-1-yl]-2-oxoethyl]-N-methylcarbamate .
user
C16H28N2O3
assistant