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 [(2S)-1-amino-1-oxopropan-2-yl] (3S)-5-oxo-1-[(1S)-1-phenylethyl]pyrrolidine-3-carboxylate .
user
C16H20N2O4
assistant