You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named [2-(4-methoxycarbonylanilino)-2-oxoethyl] (3S)-1-(3-chloro-4-methylphenyl)-5-oxopyrrolidine-3-carboxylate by IUPAC nomenclature, provide its molecular formula.
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C22H21ClN2O6
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