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Under IUPAC nomenclature, a molecule named 1-[2-(4-acetyl-3,5-dimethyl-1H-pyrrol-2-yl)-2-oxoethyl]sulfanyl-4-prop-2-enyl-[1,2,4]triazolo[4,3-a]quinazolin-5-one is given. What is its corresponding molecular formula?
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C22H21N5O3S
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