label: acetate-(3aS,4S,8bS,E)-8,8-dimethyl-3-(((R)-4-methyl-5-oxo-2,5-dihydrofuran-2-yloxy)methylene)-2,7-dioxo-3,3a,4,5,6,7,8,8b-octahydro-2H-indeno(1,2-b)furan-4-yl acetate
label_lc: acetate-(3as,4s,8bs,e)-8,8-dimethyl-3-(((r)-4-methyl-5-oxo-2,5-dihydrofuran-2-yloxy)methylene)-2,7-dioxo-3,3a,4,5,6,7,8,8b-octahydro-2h-indeno(1,2-b)furan-4-yl acetate