Ethyl 2-(4-Phenyl-2H-1,2,4-triazoline-3,5-dionyl)-3-oxobutanoate

2-Hydroxy-3-oxo-buttersaeure-ethylester

2-(羟亚氨基)乙酰乙酸乙酯

2-acetoxy-3-oxo-butanoic acid, ethyl ester

2-(2-nitro-propenyl)-pyridine