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 (1S,4S)-5-[(1S,3R)-3-amino-1-ethylcyclopentanecarbonyl]-2,5-diazabicyclo[2.2.1]heptane-2-carboxylate .
user
C18H31N3O3
assistant