N-{1-[(3R,5S)-3-((S)-2,2-Dimethyl-[1,3]dioxolan-4-yl)-2-methyl-isoxazolidin-5-yl]-2-oxo-1,2-dihydro-pyrimidin-4-yl}-benzamide

(S)-1-[(3R,5S)-5-(6-Chloro-purin-9-yl)-2-methyl-isoxazolidin-3-yl]-ethane-1,2-diol

(3'R,4''S,5'S)-1-[2-N-methyl-3-(2,2-dimethyl-1,3-dioxolan-4-yl)-1,2-isoxazolidinyl]uracil

(3'R,4''S,5'S)-6-chloro-9-[2-N-methyl-3-(2,2-dimethyl-1,3-dioxolan-4-yl)-1,2-isoxazolidinyl]purine

1-[(3R,5S)-3-((S)-1,2-Dihydroxy-ethyl)-2-methyl-isoxazolidin-5-yl]-5-methyl-1H-pyrimidine-2,4-dione