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system
Name the molecular formula for the molecule established as 5-(5-methylthiophen-2-yl)-2-[[1-(thiophen-2-ylmethyl)tetrazol-5-yl]sulfanylmethyl]-3H-thieno[2,3-d]pyrimidin-4-one using the IUPAC nomenclature.
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C18H14N6OS4
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