pentan-2-yl 3-oxobutanoate

乙酰乙酸苯酯

1-(3-甲基-1,2,4-恶二唑-5-基)丙酮

(氧代环丁烷-2-酮-4-基)-甲基膦酸二乙酯

4-chloro-4-(2,2,2-trichloroethyl)oxetan-2-one