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 [2-[2-(4-chlorobenzoyl)hydrazinyl]-2-oxoethyl] (3S)-1-(2-methoxyphenyl)-5-oxopyrrolidine-3-carboxylate ?
user
C21H20ClN3O6
assistant