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system
Provide the molecular formula for the IUPAC named substance tert-butyl (2R)-2-[2-[4-(3-chloro-4-pyridin-2-yloxyanilino)thieno[3,2-d]pyrimidin-6-yl]ethynyl]pyrrolidine-1-carboxylate .
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C28H26ClN5O3S
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