alpha-酮戊二酸

2-hydroxy-5-methylcyclopentanone

3-methyl-2-((6-methylpyridin-2-yl)oxy)cyclopent-2-enone

methyl 2-hydroxy-4-(metoxycarbonyl)-2-methylbutanoate

monosodium mono(1,3-bis(methoxycarbonyl)-4,5-dioxocyclopentane-1,3-diide)