You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named 2-[[4-chloro-2-[6-(trifluoromethyl)pyridin-3-yl]pyrrolo[2,3-b]pyridin-1-yl]methoxy]ethyl-trimethyl-lambda4-sulfane by IUPAC nomenclature, provide its molecular formula.
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C19H21ClF3N3OS
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