You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule ethyl 6-(furan-2-yl)-3-methyl-1-[methylidene-(4-nitrophenyl)-lambda4-sulfanyl]-4-oxo-6,7-dihydro-5H-indole-2-carboxylate into molecular formula.
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C23H22N2O6S
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