You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 3-[(4-chloro-2,6-difluorophenyl)-cyclopropylmethyl]-5-fluoro-7-(methylsulfonylmethyl)-1H-indole into its molecular formula.
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C20H17ClF3NO2S
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