Methanesulfonic acid (1R,2R)-2-methanesulfonyloxy-1-((S)-3-{(2S,5S)-5-[(S)-1-(toluene-4-sulfonylamino)-ethyl]-tetrahydro-furan-2-yl}-3-trimethylsilanyloxy-propyl)-4-((4S,5R)-2,2,5-trimethyl-[1,3]dioxan-4-yl)-butyl ester