Benzoic acid (2S,3R,4R,5S)-4-acetoxy-5-benzenesulfinyl-3-({[(2R,3S,5R)-3-(tert-butyl-diphenyl-silanyloxy)-5-(5-methyl-2,4-dioxo-3,4-dihydro-2H-pyrimidin-1-yl)-tetrahydro-furan-2-ylmethyl]-carbamoyl}-methyl)-tetrahydro-furan-2-ylmethyl ester