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 N-[5-chloro-2-fluoro-4-(isoquinolin-8-ylmethylamino)phenyl]sulfanyl-6-fluoropyridin-2-amine is given. What is its corresponding molecular formula?
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C21H15ClF2N4S
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