methyl 7-[(3R)-3-(oxan-2-yloxy)-5-oxocyclopenten-1-yl]heptanoate

methyl 7-(3(R)-(acetyloxy)-5-oxo-1-cyclopenten-1-yl)heptanoate

(S)-methyl 7-(3-((methylsulfonyl)oxy)-5-oxocyclopent-1-en-1-yl)heptanoate

methyl 7-(2,3,5-trioxocyclopentyl)heptanoate

2-(6'-carbomethoxyhexyl)-4(R)-hydroxy-cyclopentane-1,3-dione