Showing structure for (1r,2s,4s,4ar,5s,6r,8s,8ar)-2,4,8-tris(acetyloxy)-5,6-dimethyl-5-[2-(5-oxo-2h-furan-3-yl)ethyl]-hexahydro-2h-spiro[naphthalene-1,2'-oxiran]-8a-ylmethyl (3r)-3-hydroxy-2-methylidenebutanoate