Showing structure for (3s,3ar,4s,9as,9br)-3,6,9-trimethyl-3-{[(2e)-2-methylbut-2-enoyl]oxy}-2,7-dioxo-3ah,4h,5h,9ah,9bh-azuleno[4,5-b]furan-4-yl (2e)-2-methylbut-2-enoate