Showing structure for 10a,10'a-dimethyl (5r,5's,6r,6'r,10as,10'as)-1,1',5,5',8,8'-hexahydroxy-6,6'-dimethyl-9,9'-dioxo-5h,5'h,6h,6'h,7h,7'h-[4,4'-bixanthene]-10a,10'a-dicarboxylate