((((E)-2-((2R,3R,4R,5R)-3-(((2-Cyanoethoxy)(diisopropylamino)phosphaneyl)oxy)-5-(2,4-dioxo-3,4-dihydropyrimidin-1(2H)-yl)-4-methoxytetrahydrofuran-2-yl)vinyl)phosphoryl)bis(oxy))bis(methylene) bis(2,2-dimethylpropanoate) 1g

((((E)-2-((2R,3R,4R,5R)-3-(((2-Cyanoethoxy)(diisopropylamino)phosphaneyl)oxy)-5-(2,4-dioxo-3,4-dihydropyrimidin-1(2H)-yl)-4-methoxytetrahydrofuran-2-yl)vinyl)phosphoryl)bis(oxy))bis(methylene) bis(2,2-dimethylpropanoate) 1g