dimethyl (3-((1R,3S)-3-hydroxycyclopentyl)-2-oxopropyl)phosphonate

dimethyl (2-oxo-3-((1R,3S)-3-((tetrahydro-2H-pyran-2-yl)oxy)cyclopentyl)propyl)phosphonate

dimethyl (2-oxo-3-(3-oxocyclopentyl)propyl)phosphonate

3-(2-methyl-2-propenyl)cyclopentanone

(-)-2-methyl-(3ar,6ac)-3,3a,4,5,6,6a-hexahydro-cyclopenta[b]pyrrol-6t-ol