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system
Provide the molecular formula for the IUPAC named substance [(2R,3S,5R)-5-(3-formyl-5-iodo-2,4-dioxopyrimidin-1-yl)-3-[(1-methyl-4H-pyridin-2-yl)oxy]oxolan-2-yl]methyl acetate .
user
C18H20IN3O7
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