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Under IUPAC nomenclature, a molecule named ethyl 2-[(2R)-2-(furan-2-yl)-4-hydroxy-3-(5-methylfuran-2-carbonyl)-5-oxo-2H-pyrrol-1-yl]-4-methyl-1,3-thiazole-5-carboxylate is given. What is its corresponding molecular formula?
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C21H18N2O7S
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