a-D-Glucopyranose, cyclic2,3:4,6-bis(4,4',5,5',6,6'-hexahydroxy[1,1'-biphenyl]-2,2'-dicarboxylate)1-[2-[5-[[[2,3-O-[(4,4',5,5',6,6'-hexahydroxy[1,1'-biphenyl]-2,2'-diyl)dicarbonyl]-a-D-glucopyranosyl]oxy]carbonyl]-2,3-dihydroxyphenoxy]-3,4,5-trihydroxyben