8,9,10,14,15,29,30,31,34,35,36-Undecahydroxy-3,18,26,39,44,47-hexaoxo-2,6,19,22,25,40,43,48,50-nonaoxaspiro[bicyclo[3.3.0]octane-4,41'-nonacyclo[35.2.2.1<2,5