DTXSID80563643; 2,2'-(2,3,7,8-Tetrahydroxy-5,10-Dioxo-5,10-Dihydro[1]Benzopyrano[5,4,3-Cde][1]Benzopyran-1,6-Diyl)Bis(3,4,5-Trihydroxybenzoic Acid)