You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule (3R)-5-(3-chloro-4-methylsulfonylphenyl)-3-ethyl-5-(5-pyridin-2-yl-1H-pyrrol-2-yl)pentanal into molecular formula.
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C23H25ClN2O3S
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