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system
Name the molecular formula for the molecule established as [2-[[(1S)-1-(5-fluoropyridin-3-yl)ethyl]amino]thieno[3,2-d]pyrimidin-4-yl]-[3-(methylaminomethyl)azetidin-1-yl]methanone using the IUPAC nomenclature.
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C19H21FN6OS
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