科立内酯

methyl 2-(5-oxocyclopenten-1-yl)acetate

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

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

[(R)-5-Oxo-3-(tetrahydro-pyran-2-yloxy)-cyclopent-1-enyl]-acetic acid methyl ester