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 ethyl 6-[4-(3-chloro-4-fluorophenyl)sulfonyl-1,4-diazepan-1-yl]pyridine-3-carboxylate is given. What is its corresponding molecular formula?
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C19H21ClFN3O4S
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