3-甲基-2-氧代丁酰乙酯

(E)-α-hydroxyimino-isovaleric acid

4-异亚丙基-1,3-恶唑烷-2,5-二酮

2,5-dihydro-4-(1-methylethyl)-5-oxo-2-(3-oxobutyl)-oxazol-5-one

2,5-dihydro-4-(1-methylethyl)-2-(3-oxocyclohexyl)-oxazol-5-one