5-[[1,3-bis[3-[6-[(2R,3R,4R,5R,6R)-3-acetamido-4,5-diacetyloxy-6-(acetyloxymethyl)oxan-2-yl]oxyhexylamino]-3-oxopropoxy]-2-[[3-[6-[(2R,3R,4R,5R,6R)-3-acetamido-4,5-diacetyloxy-6-(acetyloxymethyl)oxan-2-yl]oxyhexylamino]-3-oxopropoxy]methyl]propan-2-yl]amino]-5-oxopentanoic acid