You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
methyl 3-[3-[(2,6-dichlorophenyl)carbamoyl]-4-oxo-1,8-naphthyridin-1-yl]pyrrolidine-1-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H18Cl2N4O4
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