(3aR,4R,5R,6aS)-hexahydro-2-oxo-5-[(tetrahydro-2H-pyran-2-yl)oxy]-2H-cyclopenta[b]furan-4-carboxaldehyde

(3aα,4α,5β,6aα)-hexahydro-4-nitromethyl-5-[(tetrahydro-2H-pyran-2-yl)oxy]-2H-cyclopenta[b]furan-2-one

methyl 2-((1S,2R,3S)-2-(nitromethyl)-5-oxo-3-((tetrahydro-2H-pyran-2-yl)oxy)cyclopentyl)acetate