(2R,3R,4R,5R,6S)-4,5-Diacetoxy-3-[(2S,4aR,6R,7R,8S,8aS)-7,8-diacetoxy-2-(4-methoxy-phenyl)-hexahydro-pyrano[3,2-d][1,3]dioxin-6-ylsulfanyl]-6-methoxy-tetrahydro-pyran-2-carboxylic acid methyl ester