Showing structure for 3-[(2,5-dihydroxy-4-{[2-(3-methylbut-2-en-1-yl)-1h-indol-3-yl]methyl}-3,6-dioxocyclohexa-1,4-dien-1-yl)methyl]-2-(3-methylbut-2-en-1-yl)-1h-indole-7-carboxylic acid