You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[2-(7-ethyl-1H-indol-3-yl)-2-oxoethyl] (2R)-1-(4-chlorophenyl)sulfonylpyrrolidine-2-carboxylate is the IUPAC name of a molecule. Please give its molecular formula.
user
C23H23ClN2O5S
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