You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 3-[4-(furan-2-ylmethyl)-5-[(4-methyl-5-oxo-[1,2,4]triazolo[4,3-a]quinazolin-1-yl)methylsulfanyl]-1,2,4-triazol-3-yl]propanamide into molecular formula.
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C21H20N8O3S
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