You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 6-[[2-(4-propan-2-ylphenyl)-1,3-thiazol-5-yl]methyl]-3-prop-2-enyl-2-sulfanylidene-[1,3]thiazolo[4,5-d]pyrimidin-7-one into molecular formula.
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C21H20N4OS3
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