((2S,3R)-2-Benzyloxymethyl-5-ethoxy-tetrahydro-furan-3-yl)-acetic acid methyl ester

((2S,3R)-2-Benzyloxymethyl-5-ethoxy-tetrahydro-furan-3-yl)-thioacetic acid O-methyl ester

[(2S,3R,5R)-5-(4-Amino-2-oxo-2H-pyrimidin-1-yl)-2-benzyloxymethyl-tetrahydro-furan-3-yl]-thioacetic acid O-methyl ester

[(2S,3R,5S)-5-(4-Amino-2-oxo-2H-pyrimidin-1-yl)-2-benzyloxymethyl-tetrahydro-furan-3-yl]-thioacetic acid O-methyl ester

[(2S,3R,5R)-2-Hydroxymethyl-5-(5-methyl-2,4-dioxo-3,4-dihydro-2H-pyrimidin-1-yl)-tetrahydro-furan-3-yl]-acetic acid methyl ester