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Under IUPAC nomenclature, a molecule named 8-amino-7-fluoro-2-methyl-10-oxo-6-[2-(pyridin-2-ylamino)ethylamino]-4-oxa-1-azatricyclo[7.3.1.05,13]trideca-5(13),6,8,11-tetraene-11-carboxamide is given. What is its corresponding molecular formula?
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C20H21FN6O3
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