(1'S,2'R,4''S)-1-[[2-(2,2-dimethyl-1,3-dioxolan-4-yl)cyclopropyl]-methyl]guanine

(1'S,2'R,4''S)-1-[[2-(2,2-dimethyl-1,3-dioxolan-4-yl)cyclopropyl]-methyl]-6-adenine

(1'S,2'R)-1-[[2-[(1S)-1,2-dihydroxyethyl]cyclopropyl]methyl]guanine

1-[(1S,2R)-2-((S)-2,2-Dimethyl-[1,3]dioxolan-4-yl)-cyclopropyl]-3-((E)-3-methoxy-acryloyl)-urea

1-[(1S,2R)-2-((S)-2,2-Dimethyl-[1,3]dioxolan-4-yl)-cyclopropyl]-1H-pyrimidine-2,4-dione