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