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-[(17-fluoro-3,13-dithiatetracyclo[12.4.0.02,6.07,12]octadeca-1(14),2(6),4,7,9,11,15,17-octaen-4-yl)methoxy]-N,N-dimethylethanamine;hydrochloride by IUPAC nomenclature, provide its molecular formula.
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C21H21ClFNOS2
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