(R)-4-[1,3]Dithian-2-ylidene-butan-2-ol

1-((3R,5R)-5-Dimethoxymethyl-tetrahydro-furan-3-yl)-5-methyl-1H-pyrimidine-2,4-dione

4(R)-(6-amino-9H-purin-9-yl)-2-hydroxymethyltetrahydro-2-furanmethanol

4(R)-<4-amino-2-oxo-1(2H)-pyrimidinyl>-di-(tert-butyldimethylsilyl)-2-hydroxymethyltetrahydro-2-furanmethanol