You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[2-(ethylcarbamoylamino)-2-oxoethyl] (3S)-1-(2-methoxy-5-methylphenyl)-5-oxopyrrolidine-3-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H23N3O6
assistant