Benzoic acid (1R,2R,3S,4S)-3-(tert-butyl-dimethyl-silanyloxy)-1-[(R)-1-((S)-2,2-dioxo-2λ6-[1,3,2]dioxathiolan-4-yl)-ethyl]-6-((2S,4R,6S)-4-methoxy-6-methyl-tetrahydro-pyran-2-yl)-2,4-dimethyl-hexyl ester