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system
Provide the molecular formula for the IUPAC named substance 3-[(1R,3S)-3-[[2-(5-chloro-1H-pyrrolo[2,3-b]pyridin-3-yl)-5-fluoropyrimidin-4-yl]amino]cyclohexyl]-1,1-dimethylurea .
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C20H23ClFN7O
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