acetic acid 2-[3-acetoxy-4-(4,5-diacetoxy-3-azido-6-azidomethyl-tetrahydro-pyran-2-yloxy)-5-mercaptomethyl-tetrahydro-furan-2-yloxy]-4,6-diazido-3-(4,5-diacetoxy-3-azido-6-azidomethyl-tetrahydro-pyran-2-yloxy)-cyclohexyl ester