You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named 2-[[(2-chloro-5-nitrophenyl)methyl-methylamino]methyl]-4-prop-2-enyl-1-sulfanylidene-[1,2,4]triazolo[4,3-a]quinazolin-5-one is given. What is its corresponding molecular formula?
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C21H19ClN6O3S
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