Acetic acid (2S,3R,4S,5S,6R)-4,5-diacetoxy-6-acetoxymethyl-2-[(2R,3S,4R,5R,6S)-2-benzyloxymethyl-4-hydroxy-6-phenylsulfanyl-5-(4,5,6,7-tetrachloro-1,3-dioxo-1,3-dihydro-isoindol-2-yl)-tetrahydro-pyran-3-yloxy]-tetrahydro-pyran-3-yl ester