You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named 1-(5-chlorothiophen-2-yl)sulfonyl-3-[6-(2,4-dioxo-1,7,8,9-tetrahydropyrrolo[2,3-h]quinazolin-3-yl)pyridin-3-yl]urea is given. What is its corresponding molecular formula?
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C20H15ClN6O5S2
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