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system
Provide the molecular formula for the IUPAC named substance (2R)-1-[5-(difluoromethyl)-6-ethyl-7-oxo-[1,3]thiazolo[5,4-d]pyrimidin-2-yl]-N-[(2-fluorophenyl)methyl]pyrrolidine-2-carboxamide .
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C20H20F3N5O2S
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