Showing structure for (3r)-8,9-bis[(3r)-7-hydroxy-3-methyl-3-(4-methylpent-3-en-1-yl)-9,10-dioxocyclohexa[f]chromen-8-yl]-3-methyl-3-(4-methylpent-3-en-1-yl)cyclohexa[f]chromene-7,10-dione