Showing structure for 10a,10'a-dimethyl (5r,5'r,6r,6'r,8ar,10as,10'as)-1,1',5,5',8,8'-hexahydroxy-6,6'-dimethyl-9,9'-dioxo-6',7'-dihydro-5h,5'h,6h,8ah-[2,2'-bixanthene]-10a,10'a-dicarboxylate