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system
Name the molecular formula for the molecule established as N-[2-chloro-5-(2-oxopyrrolidin-1-yl)phenyl]-3-(5,6-dimethyl-4-oxothieno[2,3-d]pyrimidin-3-yl)propanamide using the IUPAC nomenclature.
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C21H21ClN4O3S
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