富马酸单甲酯

ethyl 4-[2-[(2-methylpropan-2-yl)oxycarbonyl]hydrazinyl]-4-oxobut-2-enoate

ethyl (E)-4-hydrazinyl-4-oxobut-2-enoate

2-amino-3-[[[(E)-4-ethoxy-4-oxobut-2-enoyl]amino]sulfamoyl]propanoic acid

3-bromo-4-ethoxy-4-oxobutanoate