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What is the molecular formula of the compound with this IUPAC name N-[4-(dimethylamino)butyl]-19-fluoro-22-oxo-18-(2-pyrrolidin-1-ylethylamino)-12,16-dioxa-1-azahexacyclo[15.7.1.02,15.04,13.05,10.021,25]pentacosa-2(15),3,5,7,9,13,17(25),18,20,23-decaene-23-carboxamide ?
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