You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named 1-[7-chloro-3-(2,6-dichloro-3,5-dimethoxyphenyl)-2,6-naphthyridin-1-yl]pyrrolidine-3-carbonitrile is given. What is its corresponding molecular formula?
user
C21H17Cl3N4O2
assistant