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 5-[[[7-[(3-chloro-4-fluorophenyl)methylcarbamoyl]-2-methylpyrazolo[4,3-d]pyrimidin-3-yl]amino]methyl]thiophene-2-carboxylic acid is given. What is its corresponding molecular formula?
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C20H16ClFN6O3S
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