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 1-[2-[(2-chloropyridin-3-yl)amino]-2-oxoethyl]-N-(4-methoxyphenyl)pyrrolidine-2-carboxamide .
user
C19H21ClN4O3
assistant