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system
Name the molecular formula for the molecule established as 1-butyl-5-methyl-3-(1-methylcyclopropyl)-6-[(2-oxoimidazolidin-1-yl)methyl]thieno[2,3-d]pyrimidine-2,4-dione using the IUPAC nomenclature.
user
C19H26N4O3S
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