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system
Name the molecular formula for the molecule established as 6-fluoro-12-methylspiro[2,8,13,17,18,21-hexazatetracyclo[13.5.2.04,9.018,22]docosa-1(21),4(9),5,7,15(22),16,19-heptaene-3,1'-cyclopropane]-14-one using the IUPAC nomenclature.
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C19H19FN6O
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