You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(2S)-1-(5-chloro-2-methylanilino)-1-oxopropan-2-yl] 4-cyano-2-methyl-5-pyrrol-1-ylfuran-3-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H18ClN3O4
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