You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(2S)-1-oxo-1-pyrrolidin-1-ylpropan-2-yl] (3R)-1-(2-methoxy-5-methylphenyl)-5-oxopyrrolidine-3-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H26N2O5
assistant