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system
Provide the molecular formula for the IUPAC named substance 5-chloro-N-[1-(2,2-difluoroethyl)-5-fluoro-6-oxopyridin-3-yl]-4-(2-pyrimidin-5-ylethynyl)thiophene-2-carboxamide .
user
C18H10ClF3N4O2S
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