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system
Name the molecular formula for the molecule established as 2-[1-(5-acetyl-7H-pyrrolo[2,3-d]pyrimidin-4-yl)azetidin-2-yl]-5-chloro-3-phenylpyrrolo[2,1-f][1,2,4]triazin-4-one using the IUPAC nomenclature.
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C23H18ClN7O2
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