Showing structure for 4-hydroxy-9-{4-hydroxy-3,5,8-trimethyl-2,7-dioxo-4h,4ah,9h,9ah-azuleno[6,5-b]furan-9-yl}-3,5,8-trimethyl-4h,4ah,9h,9ah-azuleno[6,5-b]furan-2,7-dione