1-[(3aR,4R,6R,6aR)-6-(tert-Butyl-diphenyl-silanyloxymethyl)-2,2-dimethyl-tetrahydro-furo[3,4-d][1,3]dioxol-4-yl]-5-(3-hydroxy-propyl)-1H-pyrimidine-2,4-dione

Dithiophosphoric acid O-(3-{1-[(3aR,4R,6R,6aR)-6-(tert-butyl-diphenyl-silanyloxymethyl)-2,2-dimethyl-tetrahydro-furo[3,4-d][1,3]dioxol-4-yl]-2,4-dioxo-1,2,3,4-tetrahydro-pyrimidin-5-yl}-propyl) ester S,S'-diphenyl ester