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Name the molecular formula for the molecule established as 4-ethyl-5-(4-fluorophenyl)-11-(3-methoxypropyl)-2,3,7,8,11-pentazatricyclo[7.4.0.02,6]trideca-1(9),3,5,7,12-pentaen-10-one using the IUPAC nomenclature.
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C20H20FN5O2
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