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 tert-butyl 2-[[(2S)-3-(4-chlorophenyl)-1-methoxy-1-oxopropan-2-yl]carbamoyl]pyrrolidine-1-carboxylate ?
user
C20H27ClN2O5
assistant