(3aS,4S,8bS,E)-8,8-dimethyl-3-((((R)-4-methyl-5-oxo-2,5-dihydrofuran-2-yl)oxy)methylene)-2-oxo-3,3a,4,5,6,7,8,8b-octahydro-2H-indeno[1,2-b]furan-4-yl acetate
(3aS,4S,8bS,E)-8,8-dimethyl-3-((((R)-4-methyl-5-oxo-2,5-dihydrofuran-2-yl)oxy)methylene)-2-oxo-3,3a,4,5,6,7,8,8b-octahydro-2H-indeno[1,2-b]furan-4-yl acetate