Neovescalin,11-de(6-carboxy-2,3,4-trihydroxyphenyl)-15-deoxy-15-[2-(3,4-dihydroxyphenyl)-3,4-dihydro-3,5,7-trihydroxy-2H-1-benzopyran-8-yl]-,cyclic 16,18-(4,4',5,5',6,6'-hexahydroxy[1,1'-biphenyl]-2,2'-dicarboxylate),stereoisomer