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Name the molecular formula for the molecule established as ethyl 5-[[2-[[4-(4-chlorophenyl)-5-sulfanylidene-1,3,4-thiadiazol-2-yl]sulfanyl]acetyl]amino]-3-methylthiophene-2-carboxylate using the IUPAC nomenclature.
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C18H16ClN3O3S4
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