Showing structure for (3ar,4r,6ar,9s,9ar,9br)-9-methyl-3,6-dimethylidene-2,8-dioxo-octahydroazuleno[4,5-b]furan-4-yl (2e)-4-hydroxy-2-({[(2e)-2-methylbut-2-enoyl]oxy}methyl)but-2-enoate