You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name ethyl 2-[5-bromo-3-[(Z)-[3-(2-methoxy-2-oxoethyl)-1-methyl-5-oxo-2-sulfanylideneimidazolidin-4-ylidene]methyl]indol-1-yl]acetate into its molecular formula.
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C20H20BrN3O5S
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