ethyl (3E)-3-[[2-[(2E)-2-(4-ethoxy-4-oxobutan-2-ylidene)hydrazinyl]-2-oxoacetyl]hydrazinylidene]butanoate

2-Cyan-3-methyl-glutaconsaeure-ethylester

2-苯甲酰基乙酰乙酸乙酯

4-benzyl-3-methyl-pentenedioic acid diethyl ester

3-diethylamino-crotonic acid ethyl ester