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Name the molecular formula for the molecule established as 3-[4-[(1,1-dioxothian-4-yl)amino]-1-ethylpyrazolo[3,4-b]pyridin-5-yl]-4H-1,2-oxazole-5,5-dicarbonyl chloride using the IUPAC nomenclature.
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C18H19Cl2N5O5S
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