Showing structure for (1r,2s,4ar,5s,6r,8s,8ar)-5-[(2s,3as,5r,6ar)-5-ethoxy-hexahydrofuro[2,3-b]furan-2-yl]-2,8-bis(acetyloxy)-5,6-dimethyl-hexahydro-2h-spiro[naphthalene-1,2'-oxiran]-8a-ylmethyl acetate