Showing structure for 2-[8-(acetyloxy)-8a-[(acetyloxy)methyl]-5,6-dimethyl-4-[(2-methylbut-2-enoyl)oxy]-hexahydro-2h-spiro[naphthalene-1,2'-oxiran]-5-yl]-1-(5-oxo-2h-furan-3-yl)ethyl 2-methylbut-2-enoate