[(3E,3aR,4R,8bR)-8,8-dimethyl-3-[[(2R)-4-methyl-5-oxo-2H-furan-2-yl]oxymethylidene]-2-oxo-3a,4,5,6,7,8b-hexahydroindeno[1,2-b]furan-4-yl] acetate
[(3E,3aR,4R,8bR)-8,8-dimethyl-3-[[(2R)-4-methyl-5-oxo-2H-furan-2-yl]oxymethylidene]-2-oxo-3a,4,5,6,7,8b-hexahydroindeno[1,2-b]furan-4-yl] acetate