Acetic acid (2R,3R,4R,5R)-4-acetoxy-5-acetoxymethyl-2-(3,5-dimethyl-2,4-dioxo-3,4-dihydro-2H-pyrimidin-1-yl)-tetrahydro-furan-3-yl ester

1-[(2R,3R,4R,5R)-3-(tert-Butyl-dimethyl-silanyloxy)-5-(tert-butyl-dimethyl-silanyloxymethyl)-4-hydroxy-tetrahydro-furan-2-yl]-3,5-dimethyl-1H-pyrimidine-2,4-dione

1-[(2R,3S,5R)-3-(tert-Butyl-dimethyl-silanyloxy)-5-(tert-butyl-dimethyl-silanyloxymethyl)-4-oxo-tetrahydro-furan-2-yl]-3,5-dimethyl-1H-pyrimidine-2,4-dione