Showing structure for 10a,10'a-dimethyl (5s,5's,10as,10'as)-1,1',5,5',8,8'-hexahydroxy-3,3'-dimethyl-9,9'-dioxo-5h,5'h,6h,6'h,7h,7'h-[2,2'-bixanthene]-10a,10'a-dicarboxylate