(R)-methyl 2-(3-acetoxy-5-oxocyclopent-1-en-1-yl)acetate

methyl 2-[(3R)-3-hydroxy-5-oxocyclopenten-1-yl]acetate

(-)-3β-hydroxy-1β-methoxycarbonylmethylcyclopent-1-en-5-one

methyl 3-(furan-2-yl)prop-2-enoate

2-methoxycarbonylmethyl-4-hydroxy-2-cyclopenten-1-one