4-(6-chloropurin-9-yl)-2-(hydroxymethyl)oxolan-3-ol

4-(6-aminopurin-9-yl)-2-(hydroxymethyl)oxolan-3-ol

4(R)-[3,4-dihydro-2,4-dioxo-1(2H)-pyrimidinyl]-2(R)-(hydroxymethyl)-3(S)-(tert-butyldiphenylsilyloxy)tetrahydrofuran

Benzoic acid (2R,3S,4R)-4-(2,4-dioxo-3,4-dihydro-2H-pyrimidin-1-yl)-3-hydroxy-tetrahydro-furan-2-ylmethyl ester

4(R)-[{(3-ethoxy-1-oxo-2-propenyl)aminocarbonyl}amino]-2(R)-(tert-butyldimethylsilyloxymethyl)-3(S)-(tert-butyldiphenylsilyloxy)tetrahydrofuran