Showing structure for (1s,3r,3ar,5s,6as,7r,8r,10ar)-1,5-bis(acetyloxy)-7,8-dimethyl-7-[(2z)-3-methylpenta-2,4-dien-1-yl]-10-oxo-octahydro-1h-naphtho[1,8a-c]furan-3-yl acetate