1-((6aR,8R,9R,9aR)-2,2,4,4-tetraisopropyl-9-((trimethylsilyl)oxy)tetrahydro-6H-furo[3,2-f][1,3,5,2,4]trioxadisilocin-8-yl)pyrimidine-2,4(1H,3H)-dione

1-((2R,3R,4S,5R)-3,4-dihydroxy-5-(hydroxymethyl)tetrahydrofuran-2-yl)-4-((6-methylpyridin-3-yl)oxy)pyrimidin-2(1H)-one

1-((2R,3R,4S,5R)-3,4-dihydroxy-5-(hydroxymethyl)tetrahydrofuran-2-yl)-4-(pyridin-2-ylthio)pyrimidin-2(1H)-one

1-((2R,3R,4S,5R)-3,4-dihydroxy-5-(hydroxymethyl)tetrahydrofuran-2-yl)-4-(2-oxopyridin-1(2H)-yl)pyrimidin-2(1H)-one

1-((2R,3R,4S,5R)-3,4-dihydroxy-5-(hydroxymethyl)tetrahydrofuran-2-yl)-4-(pyridin-3-yloxy)pyrimidin-2(1H)-one