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Name the molecular formula for the molecule established as 4-[2-[(5-fluoro-6-imidazo[1,2-a]pyrimidin-3-ylsulfanyl-1,3-benzothiazol-2-yl)amino]-2-oxoethyl]piperazine-1-carboxylic acid using the IUPAC nomenclature.
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C20H18FN7O3S2
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