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system
Name the molecular formula for the molecule established as 4-[(10aR)-7,8-dimethoxy-1,3-dioxo-10,10a-dihydro-5H-imidazo[1,5-b]isoquinolin-2-yl]-N-(2-hydroxyethyl)butanamide using the IUPAC nomenclature.
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C19H25N3O6
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