3,4-二氢-2-乙基-3-氧代-2H-1,4-苯并噁嗪

2-乙氧甲酰苯丁酮

1-(2-呋喃基)-2-丁酮

2-(羟基甲基)丁酸

ethyl 2-ethyl-3,3-dimethyloxirane-2-carboxylate