1-((1R,2R,4R,5R)-4-Hydroxymethyl-3,6-dioxa-bicyclo[3.1.0]hex-2-yl)-3-nitro-1H-pyrimidine-2,4-dione

1-((2R,3S,4R,5R)-3-Chloro-4-hydroxy-5-hydroxymethyl-tetrahydro-furan-2-yl)-3-nitro-1H-pyrimidine-2,4-dione

1-((2R,3S,4R,5R)-3-Bromo-4-hydroxy-5-hydroxymethyl-tetrahydro-furan-2-yl)-3-nitro-1H-pyrimidine-2,4-dione

1-((2R,3S,3aR,9aR)-3-Iodo-5,5,7,7-tetraisopropyl-tetrahydro-1,4,6,8-tetraoxa-5,7-disila-cyclopentacycloocten-2-yl)-3-nitro-1H-pyrimidine-2,4-dione

1-((2R,3S,3aR,9aR)-3-Chloro-5,5,7,7-tetraisopropyl-tetrahydro-1,4,6,8-tetraoxa-5,7-disila-cyclopentacycloocten-2-yl)-3-nitro-1H-pyrimidine-2,4-dione