Showing structure for n-(6,8-dihydroxy-7-methyl-1,4-dioxonaphthalen-2-yl)-10-{1,4-dimethyl-2,8-dioxabicyclo[3.2.1]octan-3-yl}-7,9-dihydroxy-2,6,8-trimethylundeca-2,4-dienimidic acid