Acetic acid (2R,3R,4S,5S,6R)-4,5-diacetoxy-6-acetoxymethyl-2-((2R,4aR,6R,7R,8R,8aS)-7-azido-2-phenyl-6-phenylsulfanyl-hexahydro-pyrano[3,2-d][1,3]dioxin-8-yloxy)-tetrahydro-pyran-3-yl ester