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-[2-[6-cyano-5-(trifluoromethyl)pyridin-3-yl]-8-fluoro-1-oxo-3-sulfanylidene-10,10a-dihydro-5H-imidazo[1,5-b]isoquinolin-7-yl]methanesulfonamide is given. What is its corresponding molecular formula?
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C19H13F4N5O3S2
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